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Commit f042fea0 authored by Linus Torvalds's avatar Linus Torvalds
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Merge branch 'for-3.9/drivers' of git://git.kernel.dk/linux-block 

Pull block driver bits from Jens Axboe:
 "After the block IO core bits are in, please grab the driver updates
  from below as well.  It contains:

   - Fix ancient regression in dac960.  Nobody must be using that
     anymore...

   - Some good fixes from Guo Ghao for loop, fixing both potential
     oopses and deadlocks.

   - Improve mtip32xx for NUMA systems, by being a bit more clever in
     distributing work.

   - Add IBM RamSan 70/80 driver.  A second round of fixes for that is
     pending, that will come in through for-linus during the 3.9 cycle
     as per usual.

   - A few xen-blk{back,front} fixes from Konrad and Roger.

   - Other minor fixes and improvements."

* 'for-3.9/drivers' of git://git.kernel.dk/linux-block:
  loopdev: ignore negative offset when calculate loop device size
  loopdev: remove an user triggerable oops
  loopdev: move common code into loop_figure_size()
  loopdev: update block device size in loop_set_status()
  loopdev: fix a deadlock
  xen-blkback: use balloon pages for persistent grants
  xen-blkfront: drop the use of llist_for_each_entry_safe
  xen/blkback: Don't trust the handle from the frontend.
  xen-blkback: do not leak mode property
  block: IBM RamSan 70/80 driver fixes
  rsxx: add slab.h include to dma.c
  drivers/block/mtip32xx: add missing GENERIC_HARDIRQS dependency
  block: remove new __devinit/exit annotations on ramsam driver
  block: IBM RamSan 70/80 device driver
  drivers/block/mtip32xx/mtip32xx.c:1726:5: sparse: symbol 'mtip_send_trim' was not declared. Should it be static?
  drivers/block/mtip32xx/mtip32xx.c:4029:1: sparse: symbol 'mtip_workq_sdbf0' was not declared. Should it be static?
  dac960: return success instead of -ENOTTY
  mtip32xx: add trim support
  mtip32xx: Add workqueue and NUMA support
  block: delete super ancient PC-XT driver for 1980's hardware
parents ee89f812 b7a1da69
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MAINTAINERS
View file @ f042fea0
......@@ -6515,6 +6515,12 @@ S: Maintained
F: Documentation/blockdev/ramdisk.txt
F: drivers/block/brd.c
RAMSAM DRIVER (IBM RamSan 70/80 PCI SSD Flash Card)
M: Joshua Morris <josh.h.morris@us.ibm.com>
M: Philip Kelleher <pjk1939@linux.vnet.ibm.com>
S: Maintained
F: drivers/block/rsxx/
RANDOM NUMBER DRIVER
M: Theodore Ts'o" <tytso@mit.edu>
S: Maintained
......
drivers/block/DAC960.c
View file @ f042fea0
......@@ -7054,6 +7054,7 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
else
ErrorCode = 0;
}
break;
default:
ErrorCode = -ENOTTY;
}
......
drivers/block/Kconfig
View file @ f042fea0
......@@ -63,19 +63,6 @@ config AMIGA_Z2RAM
To compile this driver as a module, choose M here: the
module will be called z2ram.
config BLK_DEV_XD
tristate "XT hard disk support"
depends on ISA && ISA_DMA_API
select CHECK_SIGNATURE
help
Very old 8 bit hard disk controllers used in the IBM XT computer
will be supported if you say Y here.
To compile this driver as a module, choose M here: the
module will be called xd.
It's pretty unlikely that you have one of these: say N.
config GDROM
tristate "SEGA Dreamcast GD-ROM drive"
depends on SH_DREAMCAST
......@@ -544,4 +531,14 @@ config BLK_DEV_RBD
If unsure, say N.
config BLK_DEV_RSXX
tristate "RamSam PCIe Flash SSD Device Driver"
depends on PCI
help
Device driver for IBM's high speed PCIe SSD
storage devices: RamSan-70 and RamSan-80.
To compile this driver as a module, choose M here: the
module will be called rsxx.
endif # BLK_DEV
drivers/block/Makefile
View file @ f042fea0
......@@ -15,7 +15,6 @@ obj-$(CONFIG_ATARI_FLOPPY) += ataflop.o
obj-$(CONFIG_AMIGA_Z2RAM) += z2ram.o
obj-$(CONFIG_BLK_DEV_RAM) += brd.o
obj-$(CONFIG_BLK_DEV_LOOP) += loop.o
obj-$(CONFIG_BLK_DEV_XD) += xd.o
obj-$(CONFIG_BLK_CPQ_DA) += cpqarray.o
obj-$(CONFIG_BLK_CPQ_CISS_DA) += cciss.o
obj-$(CONFIG_BLK_DEV_DAC960) += DAC960.o
......@@ -41,4 +40,6 @@ obj-$(CONFIG_BLK_DEV_DRBD) += drbd/
obj-$(CONFIG_BLK_DEV_RBD) += rbd.o
obj-$(CONFIG_BLK_DEV_PCIESSD_MTIP32XX) += mtip32xx/
obj-$(CONFIG_BLK_DEV_RSXX) += rsxx/
swim_mod-y := swim.o swim_asm.o
drivers/block/loop.c
View file @ f042fea0
......@@ -162,12 +162,13 @@ static struct loop_func_table *xfer_funcs[MAX_LO_CRYPT] = {
static loff_t get_size(loff_t offset, loff_t sizelimit, struct file *file)
{
loff_t size, loopsize;
loff_t loopsize;
/* Compute loopsize in bytes */
size = i_size_read(file->f_mapping->host);
loopsize = size - offset;
/* offset is beyond i_size, wierd but possible */
loopsize = i_size_read(file->f_mapping->host);
if (offset > 0)
loopsize -= offset;
/* offset is beyond i_size, weird but possible */
if (loopsize < 0)
return 0;
......@@ -190,6 +191,7 @@ figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
{
loff_t size = get_size(offset, sizelimit, lo->lo_backing_file);
sector_t x = (sector_t)size;
struct block_device *bdev = lo->lo_device;
if (unlikely((loff_t)x != size))
return -EFBIG;
......@@ -198,6 +200,9 @@ figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
if (lo->lo_sizelimit != sizelimit)
lo->lo_sizelimit = sizelimit;
set_capacity(lo->lo_disk, x);
bd_set_size(bdev, (loff_t)get_capacity(bdev->bd_disk) << 9);
/* let user-space know about the new size */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
return 0;
}
......@@ -1091,10 +1096,10 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
return err;
if (lo->lo_offset != info->lo_offset ||
lo->lo_sizelimit != info->lo_sizelimit) {
lo->lo_sizelimit != info->lo_sizelimit)
if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit))
return -EFBIG;
}
loop_config_discard(lo);
memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
......@@ -1271,28 +1276,10 @@ loop_get_status64(struct loop_device *lo, struct loop_info64 __user *arg) {
static int loop_set_capacity(struct loop_device *lo, struct block_device *bdev)
{
int err;
sector_t sec;
loff_t sz;
err = -ENXIO;
if (unlikely(lo->lo_state != Lo_bound))
goto out;
err = figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
if (unlikely(err))
goto out;
sec = get_capacity(lo->lo_disk);
/* the width of sector_t may be narrow for bit-shift */
sz = sec;
sz <<= 9;
mutex_lock(&bdev->bd_mutex);
bd_set_size(bdev, sz);
/* let user-space know about the new size */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
mutex_unlock(&bdev->bd_mutex);
return -ENXIO;
out:
return err;
return figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
}
static int lo_ioctl(struct block_device *bdev, fmode_t mode,
......@@ -1845,11 +1832,15 @@ static int __init loop_init(void)
max_part = (1UL << part_shift) - 1;
}
if ((1UL << part_shift) > DISK_MAX_PARTS)
return -EINVAL;
if ((1UL << part_shift) > DISK_MAX_PARTS) {
err = -EINVAL;
goto misc_out;
}
if (max_loop > 1UL << (MINORBITS - part_shift))
return -EINVAL;
if (max_loop > 1UL << (MINORBITS - part_shift)) {
err = -EINVAL;
goto misc_out;
}
/*
* If max_loop is specified, create that many devices upfront.
......@@ -1867,8 +1858,10 @@ static int __init loop_init(void)
range = 1UL << MINORBITS;
}
if (register_blkdev(LOOP_MAJOR, "loop"))
return -EIO;
if (register_blkdev(LOOP_MAJOR, "loop")) {
err = -EIO;
goto misc_out;
}
blk_register_region(MKDEV(LOOP_MAJOR, 0), range,
THIS_MODULE, loop_probe, NULL, NULL);
......@@ -1881,6 +1874,10 @@ static int __init loop_init(void)
printk(KERN_INFO "loop: module loaded\n");
return 0;
misc_out:
misc_deregister(&loop_misc);
return err;
}
static int loop_exit_cb(int id, void *ptr, void *data)
......
drivers/block/mtip32xx/Kconfig
View file @ f042fea0
......@@ -4,6 +4,6 @@
config BLK_DEV_PCIESSD_MTIP32XX
tristate "Block Device Driver for Micron PCIe SSDs"
depends on PCI
depends on PCI && GENERIC_HARDIRQS
help
This enables the block driver for Micron PCIe SSDs.
drivers/block/mtip32xx/mtip32xx.c
View file @ f042fea0
......@@ -88,6 +88,8 @@ static int instance;
static int mtip_major;
static struct dentry *dfs_parent;
static u32 cpu_use[NR_CPUS];
static DEFINE_SPINLOCK(rssd_index_lock);
static DEFINE_IDA(rssd_index_ida);
......@@ -296,16 +298,17 @@ static int hba_reset_nosleep(struct driver_data *dd)
*/
static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
{
atomic_set(&port->commands[tag].active, 1);
int group = tag >> 5;
spin_lock(&port->cmd_issue_lock);
atomic_set(&port->commands[tag].active, 1);
/* guard SACT and CI registers */
spin_lock(&port->cmd_issue_lock[group]);
writel((1 << MTIP_TAG_BIT(tag)),
port->s_active[MTIP_TAG_INDEX(tag)]);
writel((1 << MTIP_TAG_BIT(tag)),
port->cmd_issue[MTIP_TAG_INDEX(tag)]);
spin_unlock(&port->cmd_issue_lock);
spin_unlock(&port->cmd_issue_lock[group]);
/* Set the command's timeout value.*/
port->commands[tag].comp_time = jiffies + msecs_to_jiffies(
......@@ -964,26 +967,22 @@ static void mtip_handle_tfe(struct driver_data *dd)
/*
* Handle a set device bits interrupt
*/
static inline void mtip_process_sdbf(struct driver_data *dd)
static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
u32 completed)
{
struct mtip_port *port = dd->port;
int group, tag, bit;
u32 completed;
struct driver_data *dd = port->dd;
int tag, bit;
struct mtip_cmd *command;
/* walk all bits in all slot groups */
for (group = 0; group < dd->slot_groups; group++) {
completed = readl(port->completed[group]);
if (!completed)
continue;
if (!completed) {
WARN_ON_ONCE(!completed);
return;
}
/* clear completed status register in the hardware.*/
writel(completed, port->completed[group]);
/* Process completed commands. */
for (bit = 0;
(bit < 32) && completed;
bit++, completed >>= 1) {
for (bit = 0; (bit < 32) && completed; bit++) {
if (completed & 0x01) {
tag = (group << 5) | bit;
......@@ -1012,8 +1011,12 @@ static inline void mtip_process_sdbf(struct driver_data *dd)
}
}
}
completed >>= 1;
}
}
/* If last, re-enable interrupts */
if (atomic_dec_return(&dd->irq_workers_active) == 0)
writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
}
/*
......@@ -1072,6 +1075,8 @@ static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
struct mtip_port *port = dd->port;
u32 hba_stat, port_stat;
int rv = IRQ_NONE;
int do_irq_enable = 1, i, workers;
struct mtip_work *twork;
hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
if (hba_stat) {
......@@ -1082,8 +1087,42 @@ static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
writel(port_stat, port->mmio + PORT_IRQ_STAT);
/* Demux port status */
if (likely(port_stat & PORT_IRQ_SDB_FIS))
mtip_process_sdbf(dd);
if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
do_irq_enable = 0;
WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
/* Start at 1: group zero is always local? */
for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
i++) {
twork = &dd->work[i];
twork->completed = readl(port->completed[i]);
if (twork->completed)
workers++;
}
atomic_set(&dd->irq_workers_active, workers);
if (workers) {
for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
twork = &dd->work[i];
if (twork->completed)
queue_work_on(
twork->cpu_binding,
dd->isr_workq,
&twork->work);
}
if (likely(dd->work[0].completed))
mtip_workq_sdbfx(port, 0,
dd->work[0].completed);
} else {
/*
* Chip quirk: SDB interrupt but nothing
* to complete
*/
do_irq_enable = 1;
}
}
if (unlikely(port_stat & PORT_IRQ_ERR)) {
if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
......@@ -1103,20 +1142,12 @@ static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
}
/* acknowledge interrupt */
if (unlikely(do_irq_enable))
writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
return rv;
}
/*
* Wrapper for mtip_handle_irq
* (ignores return code)
*/
static void mtip_tasklet(unsigned long data)
{
mtip_handle_irq((struct driver_data *) data);
}
/*
* HBA interrupt subroutine.
*
......@@ -1130,8 +1161,8 @@ static void mtip_tasklet(unsigned long data)
static irqreturn_t mtip_irq_handler(int irq, void *instance)
{
struct driver_data *dd = instance;
tasklet_schedule(&dd->tasklet);
return IRQ_HANDLED;
return mtip_handle_irq(dd);
}
static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
......@@ -1489,6 +1520,12 @@ static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
}
#endif
/* Demux ID.DRAT & ID.RZAT to determine trim support */
if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
port->dd->trim_supp = true;
else
port->dd->trim_supp = false;
/* Set the identify buffer as valid. */
port->identify_valid = 1;
......@@ -1675,6 +1712,81 @@ static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
return rv;
}
/*
* Trim unused sectors
*
* @dd pointer to driver_data structure
* @lba starting lba
* @len # of 512b sectors to trim
*
* return value
* -ENOMEM Out of dma memory
* -EINVAL Invalid parameters passed in, trim not supported
* -EIO Error submitting trim request to hw
*/
static int mtip_send_trim(struct driver_data *dd, unsigned int lba, unsigned int len)
{
int i, rv = 0;
u64 tlba, tlen, sect_left;
struct mtip_trim_entry *buf;
dma_addr_t dma_addr;
struct host_to_dev_fis fis;
if (!len || dd->trim_supp == false)
return -EINVAL;
/* Trim request too big */
WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
/* Trim request not aligned on 4k boundary */
WARN_ON(len % 8 != 0);
/* Warn if vu_trim structure is too big */
WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
/* Allocate a DMA buffer for the trim structure */
buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
GFP_KERNEL);
if (!buf)
return -ENOMEM;
memset(buf, 0, ATA_SECT_SIZE);
for (i = 0, sect_left = len, tlba = lba;
i < MTIP_MAX_TRIM_ENTRIES && sect_left;
i++) {
tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
MTIP_MAX_TRIM_ENTRY_LEN :
sect_left);
buf[i].lba = __force_bit2int cpu_to_le32(tlba);
buf[i].range = __force_bit2int cpu_to_le16(tlen);
tlba += tlen;
sect_left -= tlen;
}
WARN_ON(sect_left != 0);
/* Build the fis */
memset(&fis, 0, sizeof(struct host_to_dev_fis));
fis.type = 0x27;
fis.opts = 1 << 7;
fis.command = 0xfb;
fis.features = 0x60;
fis.sect_count = 1;
fis.device = ATA_DEVICE_OBS;
if (mtip_exec_internal_command(dd->port,
&fis,
5,
dma_addr,
ATA_SECT_SIZE,
0,
GFP_KERNEL,
MTIP_TRIM_TIMEOUT_MS) < 0)
rv = -EIO;
dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
return rv;
}
/*
* Get the drive capacity.
*
......@@ -3005,20 +3117,24 @@ static int mtip_hw_init(struct driver_data *dd)
hba_setup(dd);
tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd);
dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL);
dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
dd->numa_node);
if (!dd->port) {
dev_err(&dd->pdev->dev,
"Memory allocation: port structure\n");
return -ENOMEM;
}
/* Continue workqueue setup */
for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
dd->work[i].port = dd->port;
/* Counting semaphore to track command slot usage */
sema_init(&dd->port->cmd_slot, num_command_slots - 1);
/* Spinlock to prevent concurrent issue */
spin_lock_init(&dd->port->cmd_issue_lock);
for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
spin_lock_init(&dd->port->cmd_issue_lock[i]);
/* Set the port mmio base address. */
dd->port->mmio = dd->mmio + PORT_OFFSET;
......@@ -3165,6 +3281,7 @@ static int mtip_hw_init(struct driver_data *dd)
"Unable to allocate IRQ %d\n", dd->pdev->irq);
goto out2;
}
irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
/* Enable interrupts on the HBA. */
writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
......@@ -3241,7 +3358,8 @@ static int mtip_hw_init(struct driver_data *dd)
writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
dd->mmio + HOST_CTL);
/*Release the IRQ. */
/* Release the IRQ. */
irq_set_affinity_hint(dd->pdev->irq, NULL);
devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
out2:
......@@ -3291,11 +3409,9 @@ static int mtip_hw_exit(struct driver_data *dd)
del_timer_sync(&dd->port->cmd_timer);
/* Release the IRQ. */
irq_set_affinity_hint(dd->pdev->irq, NULL);
devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
/* Stop the bottom half tasklet. */
tasklet_kill(&dd->tasklet);
/* Free the command/command header memory. */
dmam_free_coherent(&dd->pdev->dev,
HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
......@@ -3641,6 +3757,12 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio)
}
}
if (unlikely(bio->bi_rw & REQ_DISCARD)) {
bio_endio(bio, mtip_send_trim(dd, bio->bi_sector,
bio_sectors(bio)));
return;
}
if (unlikely(!bio_has_data(bio))) {
blk_queue_flush(queue, 0);
bio_endio(bio, 0);
......@@ -3711,7 +3833,7 @@ static int mtip_block_initialize(struct driver_data *dd)
goto protocol_init_error;
}
dd->disk = alloc_disk(MTIP_MAX_MINORS);
dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
if (dd->disk == NULL) {
dev_err(&dd->pdev->dev,
"Unable to allocate gendisk structure\n");
......@@ -3755,7 +3877,7 @@ static int mtip_block_initialize(struct driver_data *dd)
skip_create_disk:
/* Allocate the request queue. */
dd->queue = blk_alloc_queue(GFP_KERNEL);
dd->queue = blk_alloc_queue_node(GFP_KERNEL, dd->numa_node);
if (dd->queue == NULL) {
dev_err(&dd->pdev->dev,
"Unable to allocate request queue\n");
......@@ -3783,6 +3905,15 @@ static int mtip_block_initialize(struct driver_data *dd)
*/
blk_queue_flush(dd->queue, 0);
/* Signal trim support */
if (dd->trim_supp == true) {
set_bit(QUEUE_FLAG_DISCARD, &dd->queue->queue_flags);
dd->queue->limits.discard_granularity = 4096;
blk_queue_max_discard_sectors(dd->queue,
MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
dd->queue->limits.discard_zeroes_data = 0;
}
/* Set the capacity of the device in 512 byte sectors. */
if (!(mtip_hw_get_capacity(dd, &capacity))) {
dev_warn(&dd->pdev->dev,
......@@ -3813,9 +3944,8 @@ static int mtip_block_initialize(struct driver_data *dd)
start_service_thread:
sprintf(thd_name, "mtip_svc_thd_%02d", index);
dd->mtip_svc_handler = kthread_run(mtip_service_thread,
dd, thd_name);
dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
dd, dd->numa_node, thd_name);
if (IS_ERR(dd->mtip_svc_handler)) {
dev_err(&dd->pdev->dev, "service thread failed to start\n");
......@@ -3823,7 +3953,7 @@ static int mtip_block_initialize(struct driver_data *dd)
rv = -EFAULT;
goto kthread_run_error;
}
wake_up_process(dd->mtip_svc_handler);
if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
rv = wait_for_rebuild;
......@@ -3963,6 +4093,56 @@ static int mtip_block_resume(struct driver_data *dd)
return 0;
}
static void drop_cpu(int cpu)
{
cpu_use[cpu]--;
}
static int get_least_used_cpu_on_node(int node)
{
int cpu, least_used_cpu, least_cnt;
const struct cpumask *node_mask;
node_mask = cpumask_of_node(node);
least_used_cpu = cpumask_first(node_mask);
least_cnt = cpu_use[least_used_cpu];
cpu = least_used_cpu;
for_each_cpu(cpu, node_mask) {
if (cpu_use[cpu] < least_cnt) {
least_used_cpu = cpu;
least_cnt = cpu_use[cpu];
}
}
cpu_use[least_used_cpu]++;
return least_used_cpu;
}
/* Helper for selecting a node in round robin mode */
static inline int mtip_get_next_rr_node(void)
{
static int next_node = -1;
if (next_node == -1) {
next_node = first_online_node;
return next_node;
}
next_node = next_online_node(next_node);
if (next_node == MAX_NUMNODES)
next_node = first_online_node;
return next_node;
}
static DEFINE_HANDLER(0);
static DEFINE_HANDLER(1);
static DEFINE_HANDLER(2);
static DEFINE_HANDLER(3);
static DEFINE_HANDLER(4);
static DEFINE_HANDLER(5);
static DEFINE_HANDLER(6);
static DEFINE_HANDLER(7);
/*
* Called for each supported PCI device detected.
*
......@@ -3977,9 +4157,25 @@ static int mtip_pci_probe(struct pci_dev *pdev,
{
int rv = 0;
struct driver_data *dd = NULL;
char cpu_list[256];
const struct cpumask *node_mask;
int cpu, i = 0, j = 0;
int my_node = NUMA_NO_NODE;
/* Allocate memory for this devices private data. */
dd = kzalloc(sizeof(struct driver_data), GFP_KERNEL);
my_node = pcibus_to_node(pdev->bus);
if (my_node != NUMA_NO_NODE) {
if (!node_online(my_node))
my_node = mtip_get_next_rr_node();
} else {
dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
my_node = mtip_get_next_rr_node();
}
dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
cpu_to_node(smp_processor_id()), smp_processor_id());
dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
if (dd == NULL) {
dev_err(&pdev->dev,
"Unable to allocate memory for driver data\n");
......@@ -4016,19 +4212,82 @@ static int mtip_pci_probe(struct pci_dev *pdev,
}
}
pci_set_master(pdev);
/* Copy the info we may need later into the private data structure. */
dd->major = mtip_major;
dd->instance = instance;
dd->pdev = pdev;
dd->numa_node = my_node;
memset(dd->workq_name, 0, 32);
snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
dd->isr_workq = create_workqueue(dd->workq_name);
if (!dd->isr_workq) {
dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
goto block_initialize_err;
}
memset(cpu_list, 0, sizeof(cpu_list));
node_mask = cpumask_of_node(dd->numa_node);
if (!cpumask_empty(node_mask)) {
for_each_cpu(cpu, node_mask)
{
snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
j = strlen(cpu_list);
}
dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
dd->numa_node,
topology_physical_package_id(cpumask_first(node_mask)),
nr_cpus_node(dd->numa_node),
cpu_list);
} else
dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
cpu_to_node(dd->isr_binding), dd->isr_binding);
/* first worker context always runs in ISR */
dd->work[0].cpu_binding = dd->isr_binding;
dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
dd->work[3].cpu_binding = dd->work[0].cpu_binding;
dd->work[4].cpu_binding = dd->work[1].cpu_binding;
dd->work[5].cpu_binding = dd->work[2].cpu_binding;
dd->work[6].cpu_binding = dd->work[2].cpu_binding;
dd->work[7].cpu_binding = dd->work[1].cpu_binding;
/* Log the bindings */
for_each_present_cpu(cpu) {
memset(cpu_list, 0, sizeof(cpu_list));
for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
if (dd->work[i].cpu_binding == cpu) {
snprintf(&cpu_list[j], 256 - j, "%d ", i);
j = strlen(cpu_list);
}
}
if (j)
dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
}
INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
pci_set_master(pdev);
if (pci_enable_msi(pdev)) {
dev_warn(&pdev->dev,
"Unable to enable MSI interrupt.\n");
goto block_initialize_err;
}
/* Copy the info we may need later into the private data structure. */
dd->major = mtip_major;
dd->instance = instance;
dd->pdev = pdev;
/* Initialize the block layer. */
rv = mtip_block_initialize(dd);
if (rv < 0) {
......@@ -4048,7 +4307,13 @@ static int mtip_pci_probe(struct pci_dev *pdev,
block_initialize_err:
pci_disable_msi(pdev);
if (dd->isr_workq) {
flush_workqueue(dd->isr_workq);
destroy_workqueue(dd->isr_workq);
drop_cpu(dd->work[0].cpu_binding);
drop_cpu(dd->work[1].cpu_binding);
drop_cpu(dd->work[2].cpu_binding);
}
setmask_err:
pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
......@@ -4089,6 +4354,14 @@ static void mtip_pci_remove(struct pci_dev *pdev)
/* Clean up the block layer. */
mtip_block_remove(dd);
if (dd->isr_workq) {
flush_workqueue(dd->isr_workq);
destroy_workqueue(dd->isr_workq);
drop_cpu(dd->work[0].cpu_binding);
drop_cpu(dd->work[1].cpu_binding);
drop_cpu(dd->work[2].cpu_binding);
}
pci_disable_msi(pdev);
kfree(dd);
......
drivers/block/mtip32xx/mtip32xx.h
View file @ f042fea0
......@@ -164,6 +164,35 @@ struct smart_attr {
u8 res[3];
} __packed;
struct mtip_work {
struct work_struct work;
void *port;
int cpu_binding;
u32 completed;
} ____cacheline_aligned_in_smp;
#define DEFINE_HANDLER(group) \
void mtip_workq_sdbf##group(struct work_struct *work) \
{ \
struct mtip_work *w = (struct mtip_work *) work; \
mtip_workq_sdbfx(w->port, group, w->completed); \
}
#define MTIP_TRIM_TIMEOUT_MS 240000
#define MTIP_MAX_TRIM_ENTRIES 8
#define MTIP_MAX_TRIM_ENTRY_LEN 0xfff8
struct mtip_trim_entry {
u32 lba; /* starting lba of region */
u16 rsvd; /* unused */
u16 range; /* # of 512b blocks to trim */
} __packed;
struct mtip_trim {
/* Array of regions to trim */
struct mtip_trim_entry entry[MTIP_MAX_TRIM_ENTRIES];
} __packed;
/* Register Frame Information Structure (FIS), host to device. */
struct host_to_dev_fis {
/*
......@@ -424,7 +453,7 @@ struct mtip_port {
*/
struct semaphore cmd_slot;
/* Spinlock for working around command-issue bug. */
spinlock_t cmd_issue_lock;
spinlock_t cmd_issue_lock[MTIP_MAX_SLOT_GROUPS];
};
/*
......@@ -447,9 +476,6 @@ struct driver_data {
struct mtip_port *port; /* Pointer to the port data structure. */
/* Tasklet used to process the bottom half of the ISR. */
struct tasklet_struct tasklet;
unsigned product_type; /* magic value declaring the product type */
unsigned slot_groups; /* number of slot groups the product supports */
......@@ -461,6 +487,20 @@ struct driver_data {
struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
struct dentry *dfs_node;
bool trim_supp; /* flag indicating trim support */
int numa_node; /* NUMA support */
char workq_name[32];
struct workqueue_struct *isr_workq;
struct mtip_work work[MTIP_MAX_SLOT_GROUPS];
atomic_t irq_workers_active;
int isr_binding;
};
#endif
drivers/block/rsxx/Makefile 0 → 100644
View file @ f042fea0
obj-$(CONFIG_BLK_DEV_RSXX) += rsxx.o
rsxx-y := config.o core.o cregs.o dev.o dma.o
drivers/block/rsxx/config.c 0 → 100644
View file @ f042fea0
/*
* Filename: config.c
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/types.h>
#include <linux/crc32.h>
#include <linux/swab.h>
#include "rsxx_priv.h"
#include "rsxx_cfg.h"
static void initialize_config(void *config)
{
struct rsxx_card_cfg *cfg = config;
cfg->hdr.version = RSXX_CFG_VERSION;
cfg->data.block_size = RSXX_HW_BLK_SIZE;
cfg->data.stripe_size = RSXX_HW_BLK_SIZE;
cfg->data.vendor_id = RSXX_VENDOR_ID_TMS_IBM;
cfg->data.cache_order = (-1);
cfg->data.intr_coal.mode = RSXX_INTR_COAL_DISABLED;
cfg->data.intr_coal.count = 0;
cfg->data.intr_coal.latency = 0;
}
static u32 config_data_crc32(struct rsxx_card_cfg *cfg)
{
/*
* Return the compliment of the CRC to ensure compatibility
* (i.e. this is how early rsxx drivers did it.)
*/
return ~crc32(~0, &cfg->data, sizeof(cfg->data));
}
/*----------------- Config Byte Swap Functions -------------------*/
static void config_hdr_be_to_cpu(struct card_cfg_hdr *hdr)
{
hdr->version = be32_to_cpu((__force __be32) hdr->version);
hdr->crc = be32_to_cpu((__force __be32) hdr->crc);
}
static void config_hdr_cpu_to_be(struct card_cfg_hdr *hdr)
{
hdr->version = (__force u32) cpu_to_be32(hdr->version);
hdr->crc = (__force u32) cpu_to_be32(hdr->crc);
}
static void config_data_swab(struct rsxx_card_cfg *cfg)
{
u32 *data = (u32 *) &cfg->data;
int i;
for (i = 0; i < (sizeof(cfg->data) / 4); i++)
data[i] = swab32(data[i]);
}
static void config_data_le_to_cpu(struct rsxx_card_cfg *cfg)
{
u32 *data = (u32 *) &cfg->data;
int i;
for (i = 0; i < (sizeof(cfg->data) / 4); i++)
data[i] = le32_to_cpu((__force __le32) data[i]);
}
static void config_data_cpu_to_le(struct rsxx_card_cfg *cfg)
{
u32 *data = (u32 *) &cfg->data;
int i;
for (i = 0; i < (sizeof(cfg->data) / 4); i++)
data[i] = (__force u32) cpu_to_le32(data[i]);
}
/*----------------- Config Operations ------------------*/
static int rsxx_save_config(struct rsxx_cardinfo *card)
{
struct rsxx_card_cfg cfg;
int st;
memcpy(&cfg, &card->config, sizeof(cfg));
if (unlikely(cfg.hdr.version != RSXX_CFG_VERSION)) {
dev_err(CARD_TO_DEV(card),
"Cannot save config with invalid version %d\n",
cfg.hdr.version);
return -EINVAL;
}
/* Convert data to little endian for the CRC calculation. */
config_data_cpu_to_le(&cfg);
cfg.hdr.crc = config_data_crc32(&cfg);
/*
* Swap the data from little endian to big endian so it can be
* stored.
*/
config_data_swab(&cfg);
config_hdr_cpu_to_be(&cfg.hdr);
st = rsxx_creg_write(card, CREG_ADD_CONFIG, sizeof(cfg), &cfg, 1);
if (st)
return st;
return 0;
}
int rsxx_load_config(struct rsxx_cardinfo *card)
{
int st;
u32 crc;
st = rsxx_creg_read(card, CREG_ADD_CONFIG, sizeof(card->config),
&card->config, 1);
if (st) {
dev_err(CARD_TO_DEV(card),
"Failed reading card config.\n");
return st;
}
config_hdr_be_to_cpu(&card->config.hdr);
if (card->config.hdr.version == RSXX_CFG_VERSION) {
/*
* We calculate the CRC with the data in little endian, because
* early drivers did not take big endian CPUs into account.
* The data is always stored in big endian, so we need to byte
* swap it before calculating the CRC.
*/
config_data_swab(&card->config);
/* Check the CRC */
crc = config_data_crc32(&card->config);
if (crc != card->config.hdr.crc) {
dev_err(CARD_TO_DEV(card),
"Config corruption detected!\n");
dev_info(CARD_TO_DEV(card),
"CRC (sb x%08x is x%08x)\n",
card->config.hdr.crc, crc);
return -EIO;
}
/* Convert the data to CPU byteorder */
config_data_le_to_cpu(&card->config);
} else if (card->config.hdr.version != 0) {
dev_err(CARD_TO_DEV(card),
"Invalid config version %d.\n",
card->config.hdr.version);
/*
* Config version changes require special handling from the
* user
*/
return -EINVAL;
} else {
dev_info(CARD_TO_DEV(card),
"Initializing card configuration.\n");
initialize_config(card);
st = rsxx_save_config(card);
if (st)
return st;
}
card->config_valid = 1;
dev_dbg(CARD_TO_DEV(card), "version: x%08x\n",
card->config.hdr.version);
dev_dbg(CARD_TO_DEV(card), "crc: x%08x\n",
card->config.hdr.crc);
dev_dbg(CARD_TO_DEV(card), "block_size: x%08x\n",
card->config.data.block_size);
dev_dbg(CARD_TO_DEV(card), "stripe_size: x%08x\n",
card->config.data.stripe_size);
dev_dbg(CARD_TO_DEV(card), "vendor_id: x%08x\n",
card->config.data.vendor_id);
dev_dbg(CARD_TO_DEV(card), "cache_order: x%08x\n",
card->config.data.cache_order);
dev_dbg(CARD_TO_DEV(card), "mode: x%08x\n",
card->config.data.intr_coal.mode);
dev_dbg(CARD_TO_DEV(card), "count: x%08x\n",
card->config.data.intr_coal.count);
dev_dbg(CARD_TO_DEV(card), "latency: x%08x\n",
card->config.data.intr_coal.latency);
return 0;
}
drivers/block/rsxx/core.c 0 → 100644
View file @ f042fea0
/*
* Filename: core.c
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/genhd.h>
#include <linux/idr.h>
#include "rsxx_priv.h"
#include "rsxx_cfg.h"
#define NO_LEGACY 0
MODULE_DESCRIPTION("IBM RamSan PCIe Flash SSD Device Driver");
MODULE_AUTHOR("IBM <support@ramsan.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);
static unsigned int force_legacy = NO_LEGACY;
module_param(force_legacy, uint, 0444);
MODULE_PARM_DESC(force_legacy, "Force the use of legacy type PCI interrupts");
static DEFINE_IDA(rsxx_disk_ida);
static DEFINE_SPINLOCK(rsxx_ida_lock);
/*----------------- Interrupt Control & Handling -------------------*/
static void __enable_intr(unsigned int *mask, unsigned int intr)
{
*mask |= intr;
}
static void __disable_intr(unsigned int *mask, unsigned int intr)
{
*mask &= ~intr;
}
/*
* NOTE: Disabling the IER will disable the hardware interrupt.
* Disabling the ISR will disable the software handling of the ISR bit.
*
* Enable/Disable interrupt functions assume the card->irq_lock
* is held by the caller.
*/
void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr)
{
if (unlikely(card->halt))
return;
__enable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr)
{
__disable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
unsigned int intr)
{
if (unlikely(card->halt))
return;
__enable_intr(&card->isr_mask, intr);
__enable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
unsigned int intr)
{
__disable_intr(&card->isr_mask, intr);
__disable_intr(&card->ier_mask, intr);
iowrite32(card->ier_mask, card->regmap + IER);
}
static irqreturn_t rsxx_isr(int irq, void *pdata)
{
struct rsxx_cardinfo *card = pdata;
unsigned int isr;
int handled = 0;
int reread_isr;
int i;
spin_lock(&card->irq_lock);
do {
reread_isr = 0;
isr = ioread32(card->regmap + ISR);
if (isr == 0xffffffff) {
/*
* A few systems seem to have an intermittent issue
* where PCI reads return all Fs, but retrying the read
* a little later will return as expected.
*/
dev_info(CARD_TO_DEV(card),
"ISR = 0xFFFFFFFF, retrying later\n");
break;
}
isr &= card->isr_mask;
if (!isr)
break;
for (i = 0; i < card->n_targets; i++) {
if (isr & CR_INTR_DMA(i)) {
if (card->ier_mask & CR_INTR_DMA(i)) {
rsxx_disable_ier(card, CR_INTR_DMA(i));
reread_isr = 1;
}
queue_work(card->ctrl[i].done_wq,
&card->ctrl[i].dma_done_work);
handled++;
}
}
if (isr & CR_INTR_CREG) {
schedule_work(&card->creg_ctrl.done_work);
handled++;
}
if (isr & CR_INTR_EVENT) {
schedule_work(&card->event_work);
rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
handled++;
}
} while (reread_isr);
spin_unlock(&card->irq_lock);
return handled ? IRQ_HANDLED : IRQ_NONE;
}
/*----------------- Card Event Handler -------------------*/
static char *rsxx_card_state_to_str(unsigned int state)
{
static char *state_strings[] = {
"Unknown", "Shutdown", "Starting", "Formatting",
"Uninitialized", "Good", "Shutting Down",
"Fault", "Read Only Fault", "dStroying"
};
return state_strings[ffs(state)];
}
static void card_state_change(struct rsxx_cardinfo *card,
unsigned int new_state)
{
int st;
dev_info(CARD_TO_DEV(card),
"card state change detected.(%s -> %s)\n",
rsxx_card_state_to_str(card->state),
rsxx_card_state_to_str(new_state));
card->state = new_state;
/* Don't attach DMA interfaces if the card has an invalid config */
if (!card->config_valid)
return;
switch (new_state) {
case CARD_STATE_RD_ONLY_FAULT:
dev_crit(CARD_TO_DEV(card),
"Hardware has entered read-only mode!\n");
/*
* Fall through so the DMA devices can be attached and
* the user can attempt to pull off their data.
*/
case CARD_STATE_GOOD:
st = rsxx_get_card_size8(card, &card->size8);
if (st)
dev_err(CARD_TO_DEV(card),
"Failed attaching DMA devices\n");
if (card->config_valid)
set_capacity(card->gendisk, card->size8 >> 9);
break;
case CARD_STATE_FAULT:
dev_crit(CARD_TO_DEV(card),
"Hardware Fault reported!\n");
/* Fall through. */
/* Everything else, detach DMA interface if it's attached. */
case CARD_STATE_SHUTDOWN:
case CARD_STATE_STARTING:
case CARD_STATE_FORMATTING:
case CARD_STATE_UNINITIALIZED:
case CARD_STATE_SHUTTING_DOWN:
/*
* dStroy is a term coined by marketing to represent the low level
* secure erase.
*/
case CARD_STATE_DSTROYING:
set_capacity(card->gendisk, 0);
break;
}
}
static void card_event_handler(struct work_struct *work)
{
struct rsxx_cardinfo *card;
unsigned int state;
unsigned long flags;
int st;
card = container_of(work, struct rsxx_cardinfo, event_work);
if (unlikely(card->halt))
return;
/*
* Enable the interrupt now to avoid any weird race conditions where a
* state change might occur while rsxx_get_card_state() is
* processing a returned creg cmd.
*/
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
spin_unlock_irqrestore(&card->irq_lock, flags);
st = rsxx_get_card_state(card, &state);
if (st) {
dev_info(CARD_TO_DEV(card),
"Failed reading state after event.\n");
return;
}
if (card->state != state)
card_state_change(card, state);
if (card->creg_ctrl.creg_stats.stat & CREG_STAT_LOG_PENDING)
rsxx_read_hw_log(card);
}
/*----------------- Card Operations -------------------*/
static int card_shutdown(struct rsxx_cardinfo *card)
{
unsigned int state;
signed long start;
const int timeout = msecs_to_jiffies(120000);
int st;
/* We can't issue a shutdown if the card is in a transition state */
start = jiffies;
do {
st = rsxx_get_card_state(card, &state);
if (st)
return st;
} while (state == CARD_STATE_STARTING &&
(jiffies - start < timeout));
if (state == CARD_STATE_STARTING)
return -ETIMEDOUT;
/* Only issue a shutdown if we need to */
if ((state != CARD_STATE_SHUTTING_DOWN) &&
(state != CARD_STATE_SHUTDOWN)) {
st = rsxx_issue_card_cmd(card, CARD_CMD_SHUTDOWN);
if (st)
return st;
}
start = jiffies;
do {
st = rsxx_get_card_state(card, &state);
if (st)
return st;
} while (state != CARD_STATE_SHUTDOWN &&
(jiffies - start < timeout));
if (state != CARD_STATE_SHUTDOWN)
return -ETIMEDOUT;
return 0;
}
/*----------------- Driver Initialization & Setup -------------------*/
/* Returns: 0 if the driver is compatible with the device
-1 if the driver is NOT compatible with the device */
static int rsxx_compatibility_check(struct rsxx_cardinfo *card)
{
unsigned char pci_rev;
pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);
if (pci_rev > RS70_PCI_REV_SUPPORTED)
return -1;
return 0;
}
static int rsxx_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
struct rsxx_cardinfo *card;
int st;
dev_info(&dev->dev, "PCI-Flash SSD discovered\n");
card = kzalloc(sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->dev = dev;
pci_set_drvdata(dev, card);
do {
if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
st = -ENOMEM;
goto failed_ida_get;
}
spin_lock(&rsxx_ida_lock);
st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
spin_unlock(&rsxx_ida_lock);
} while (st == -EAGAIN);
if (st)
goto failed_ida_get;
st = pci_enable_device(dev);
if (st)
goto failed_enable;
pci_set_master(dev);
pci_set_dma_max_seg_size(dev, RSXX_HW_BLK_SIZE);
st = pci_set_dma_mask(dev, DMA_BIT_MASK(64));
if (st) {
dev_err(CARD_TO_DEV(card),
"No usable DMA configuration,aborting\n");
goto failed_dma_mask;
}
st = pci_request_regions(dev, DRIVER_NAME);
if (st) {
dev_err(CARD_TO_DEV(card),
"Failed to request memory region\n");
goto failed_request_regions;
}
if (pci_resource_len(dev, 0) == 0) {
dev_err(CARD_TO_DEV(card), "BAR0 has length 0!\n");
st = -ENOMEM;
goto failed_iomap;
}
card->regmap = pci_iomap(dev, 0, 0);
if (!card->regmap) {
dev_err(CARD_TO_DEV(card), "Failed to map BAR0\n");
st = -ENOMEM;
goto failed_iomap;
}
spin_lock_init(&card->irq_lock);
card->halt = 0;
spin_lock_irq(&card->irq_lock);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irq(&card->irq_lock);
if (!force_legacy) {
st = pci_enable_msi(dev);
if (st)
dev_warn(CARD_TO_DEV(card),
"Failed to enable MSI\n");
}
st = request_irq(dev->irq, rsxx_isr, IRQF_DISABLED | IRQF_SHARED,
DRIVER_NAME, card);
if (st) {
dev_err(CARD_TO_DEV(card),
"Failed requesting IRQ%d\n", dev->irq);
goto failed_irq;
}
/************* Setup Processor Command Interface *************/
rsxx_creg_setup(card);
spin_lock_irq(&card->irq_lock);
rsxx_enable_ier_and_isr(card, CR_INTR_CREG);
spin_unlock_irq(&card->irq_lock);
st = rsxx_compatibility_check(card);
if (st) {
dev_warn(CARD_TO_DEV(card),
"Incompatible driver detected. Please update the driver.\n");
st = -EINVAL;
goto failed_compatiblity_check;
}
/************* Load Card Config *************/
st = rsxx_load_config(card);
if (st)
dev_err(CARD_TO_DEV(card),
"Failed loading card config\n");
/************* Setup DMA Engine *************/
st = rsxx_get_num_targets(card, &card->n_targets);
if (st)
dev_info(CARD_TO_DEV(card),
"Failed reading the number of DMA targets\n");
card->ctrl = kzalloc(card->n_targets * sizeof(*card->ctrl), GFP_KERNEL);
if (!card->ctrl) {
st = -ENOMEM;
goto failed_dma_setup;
}
st = rsxx_dma_setup(card);
if (st) {
dev_info(CARD_TO_DEV(card),
"Failed to setup DMA engine\n");
goto failed_dma_setup;
}
/************* Setup Card Event Handler *************/
INIT_WORK(&card->event_work, card_event_handler);
st = rsxx_setup_dev(card);
if (st)
goto failed_create_dev;
rsxx_get_card_state(card, &card->state);
dev_info(CARD_TO_DEV(card),
"card state: %s\n",
rsxx_card_state_to_str(card->state));
/*
* Now that the DMA Engine and devices have been setup,
* we can enable the event interrupt(it kicks off actions in
* those layers so we couldn't enable it right away.)
*/
spin_lock_irq(&card->irq_lock);
rsxx_enable_ier_and_isr(card, CR_INTR_EVENT);
spin_unlock_irq(&card->irq_lock);
if (card->state == CARD_STATE_SHUTDOWN) {
st = rsxx_issue_card_cmd(card, CARD_CMD_STARTUP);
if (st)
dev_crit(CARD_TO_DEV(card),
"Failed issuing card startup\n");
} else if (card->state == CARD_STATE_GOOD ||
card->state == CARD_STATE_RD_ONLY_FAULT) {
st = rsxx_get_card_size8(card, &card->size8);
if (st)
card->size8 = 0;
}
rsxx_attach_dev(card);
return 0;
failed_create_dev:
rsxx_dma_destroy(card);
failed_dma_setup:
failed_compatiblity_check:
spin_lock_irq(&card->irq_lock);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irq(&card->irq_lock);
free_irq(dev->irq, card);
if (!force_legacy)
pci_disable_msi(dev);
failed_irq:
pci_iounmap(dev, card->regmap);
failed_iomap:
pci_release_regions(dev);
failed_request_regions:
failed_dma_mask:
pci_disable_device(dev);
failed_enable:
spin_lock(&rsxx_ida_lock);
ida_remove(&rsxx_disk_ida, card->disk_id);
spin_unlock(&rsxx_ida_lock);
failed_ida_get:
kfree(card);
return st;
}
static void rsxx_pci_remove(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
unsigned long flags;
int st;
int i;
if (!card)
return;
dev_info(CARD_TO_DEV(card),
"Removing PCI-Flash SSD.\n");
rsxx_detach_dev(card);
for (i = 0; i < card->n_targets; i++) {
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
spin_unlock_irqrestore(&card->irq_lock, flags);
}
st = card_shutdown(card);
if (st)
dev_crit(CARD_TO_DEV(card), "Shutdown failed!\n");
/* Sync outstanding event handlers. */
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_EVENT);
spin_unlock_irqrestore(&card->irq_lock, flags);
/* Prevent work_structs from re-queuing themselves. */
card->halt = 1;
cancel_work_sync(&card->event_work);
rsxx_destroy_dev(card);
rsxx_dma_destroy(card);
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_ALL);
spin_unlock_irqrestore(&card->irq_lock, flags);
free_irq(dev->irq, card);
if (!force_legacy)
pci_disable_msi(dev);
rsxx_creg_destroy(card);
pci_iounmap(dev, card->regmap);
pci_disable_device(dev);
pci_release_regions(dev);
kfree(card);
}
static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
{
/* We don't support suspend at this time. */
return -ENOSYS;
}
static void rsxx_pci_shutdown(struct pci_dev *dev)
{
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
unsigned long flags;
int i;
if (!card)
return;
dev_info(CARD_TO_DEV(card), "Shutting down PCI-Flash SSD.\n");
rsxx_detach_dev(card);
for (i = 0; i < card->n_targets; i++) {
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_DMA(i));
spin_unlock_irqrestore(&card->irq_lock, flags);
}
card_shutdown(card);
}
static DEFINE_PCI_DEVICE_TABLE(rsxx_pci_ids) = {
{PCI_DEVICE(PCI_VENDOR_ID_TMS_IBM, PCI_DEVICE_ID_RS70_FLASH)},
{PCI_DEVICE(PCI_VENDOR_ID_TMS_IBM, PCI_DEVICE_ID_RS70D_FLASH)},
{PCI_DEVICE(PCI_VENDOR_ID_TMS_IBM, PCI_DEVICE_ID_RS80_FLASH)},
{PCI_DEVICE(PCI_VENDOR_ID_TMS_IBM, PCI_DEVICE_ID_RS81_FLASH)},
{0,},
};
MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);
static struct pci_driver rsxx_pci_driver = {
.name = DRIVER_NAME,
.id_table = rsxx_pci_ids,
.probe = rsxx_pci_probe,
.remove = rsxx_pci_remove,
.suspend = rsxx_pci_suspend,
.shutdown = rsxx_pci_shutdown,
};
static int __init rsxx_core_init(void)
{
int st;
st = rsxx_dev_init();
if (st)
return st;
st = rsxx_dma_init();
if (st)
goto dma_init_failed;
st = rsxx_creg_init();
if (st)
goto creg_init_failed;
return pci_register_driver(&rsxx_pci_driver);
creg_init_failed:
rsxx_dma_cleanup();
dma_init_failed:
rsxx_dev_cleanup();
return st;
}
static void __exit rsxx_core_cleanup(void)
{
pci_unregister_driver(&rsxx_pci_driver);
rsxx_creg_cleanup();
rsxx_dma_cleanup();
rsxx_dev_cleanup();
}
module_init(rsxx_core_init);
module_exit(rsxx_core_cleanup);
drivers/block/rsxx/cregs.c 0 → 100644
View file @ f042fea0
/*
* Filename: cregs.c
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/completion.h>
#include <linux/slab.h>
#include "rsxx_priv.h"
#define CREG_TIMEOUT_MSEC 10000
typedef void (*creg_cmd_cb)(struct rsxx_cardinfo *card,
struct creg_cmd *cmd,
int st);
struct creg_cmd {
struct list_head list;
creg_cmd_cb cb;
void *cb_private;
unsigned int op;
unsigned int addr;
int cnt8;
void *buf;
unsigned int stream;
unsigned int status;
};
static struct kmem_cache *creg_cmd_pool;
/*------------ Private Functions --------------*/
#if defined(__LITTLE_ENDIAN)
#define LITTLE_ENDIAN 1
#elif defined(__BIG_ENDIAN)
#define LITTLE_ENDIAN 0
#else
#error Unknown endianess!!! Aborting...
#endif
static void copy_to_creg_data(struct rsxx_cardinfo *card,
int cnt8,
void *buf,
unsigned int stream)
{
int i = 0;
u32 *data = buf;
for (i = 0; cnt8 > 0; i++, cnt8 -= 4) {
/*
* Firmware implementation makes it necessary to byte swap on
* little endian processors.
*/
if (LITTLE_ENDIAN && stream)
iowrite32be(data[i], card->regmap + CREG_DATA(i));
else
iowrite32(data[i], card->regmap + CREG_DATA(i));
}
}
static void copy_from_creg_data(struct rsxx_cardinfo *card,
int cnt8,
void *buf,
unsigned int stream)
{
int i = 0;
u32 *data = buf;
for (i = 0; cnt8 > 0; i++, cnt8 -= 4) {
/*
* Firmware implementation makes it necessary to byte swap on
* little endian processors.
*/
if (LITTLE_ENDIAN && stream)
data[i] = ioread32be(card->regmap + CREG_DATA(i));
else
data[i] = ioread32(card->regmap + CREG_DATA(i));
}
}
static struct creg_cmd *pop_active_cmd(struct rsxx_cardinfo *card)
{
struct creg_cmd *cmd;
/*
* Spin lock is needed because this can be called in atomic/interrupt
* context.
*/
spin_lock_bh(&card->creg_ctrl.lock);
cmd = card->creg_ctrl.active_cmd;
card->creg_ctrl.active_cmd = NULL;
spin_unlock_bh(&card->creg_ctrl.lock);
return cmd;
}
static void creg_issue_cmd(struct rsxx_cardinfo *card, struct creg_cmd *cmd)
{
iowrite32(cmd->addr, card->regmap + CREG_ADD);
iowrite32(cmd->cnt8, card->regmap + CREG_CNT);
if (cmd->op == CREG_OP_WRITE) {
if (cmd->buf)
copy_to_creg_data(card, cmd->cnt8,
cmd->buf, cmd->stream);
}
/*
* Data copy must complete before initiating the command. This is
* needed for weakly ordered processors (i.e. PowerPC), so that all
* neccessary registers are written before we kick the hardware.
*/
wmb();
/* Setting the valid bit will kick off the command. */
iowrite32(cmd->op, card->regmap + CREG_CMD);
}
static void creg_kick_queue(struct rsxx_cardinfo *card)
{
if (card->creg_ctrl.active || list_empty(&card->creg_ctrl.queue))
return;
card->creg_ctrl.active = 1;
card->creg_ctrl.active_cmd = list_first_entry(&card->creg_ctrl.queue,
struct creg_cmd, list);
list_del(&card->creg_ctrl.active_cmd->list);
card->creg_ctrl.q_depth--;
/*
* We have to set the timer before we push the new command. Otherwise,
* we could create a race condition that would occur if the timer
* was not canceled, and expired after the new command was pushed,
* but before the command was issued to hardware.
*/
mod_timer(&card->creg_ctrl.cmd_timer,
jiffies + msecs_to_jiffies(CREG_TIMEOUT_MSEC));
creg_issue_cmd(card, card->creg_ctrl.active_cmd);
}
static int creg_queue_cmd(struct rsxx_cardinfo *card,
unsigned int op,
unsigned int addr,
unsigned int cnt8,
void *buf,
int stream,
creg_cmd_cb callback,
void *cb_private)
{
struct creg_cmd *cmd;
/* Don't queue stuff up if we're halted. */
if (unlikely(card->halt))
return -EINVAL;
if (card->creg_ctrl.reset)
return -EAGAIN;
if (cnt8 > MAX_CREG_DATA8)
return -EINVAL;
cmd = kmem_cache_alloc(creg_cmd_pool, GFP_KERNEL);
if (!cmd)
return -ENOMEM;
INIT_LIST_HEAD(&cmd->list);
cmd->op = op;
cmd->addr = addr;
cmd->cnt8 = cnt8;
cmd->buf = buf;
cmd->stream = stream;
cmd->cb = callback;
cmd->cb_private = cb_private;
cmd->status = 0;
spin_lock(&card->creg_ctrl.lock);
list_add_tail(&cmd->list, &card->creg_ctrl.queue);
card->creg_ctrl.q_depth++;
creg_kick_queue(card);
spin_unlock(&card->creg_ctrl.lock);
return 0;
}
static void creg_cmd_timed_out(unsigned long data)
{
struct rsxx_cardinfo *card = (struct rsxx_cardinfo *) data;
struct creg_cmd *cmd;
cmd = pop_active_cmd(card);
if (cmd == NULL) {
card->creg_ctrl.creg_stats.creg_timeout++;
dev_warn(CARD_TO_DEV(card),
"No active command associated with timeout!\n");
return;
}
if (cmd->cb)
cmd->cb(card, cmd, -ETIMEDOUT);
kmem_cache_free(creg_cmd_pool, cmd);
spin_lock(&card->creg_ctrl.lock);
card->creg_ctrl.active = 0;
creg_kick_queue(card);
spin_unlock(&card->creg_ctrl.lock);
}
static void creg_cmd_done(struct work_struct *work)
{
struct rsxx_cardinfo *card;
struct creg_cmd *cmd;
int st = 0;
card = container_of(work, struct rsxx_cardinfo,
creg_ctrl.done_work);
/*
* The timer could not be cancelled for some reason,
* race to pop the active command.
*/
if (del_timer_sync(&card->creg_ctrl.cmd_timer) == 0)
card->creg_ctrl.creg_stats.failed_cancel_timer++;
cmd = pop_active_cmd(card);
if (cmd == NULL) {
dev_err(CARD_TO_DEV(card),
"Spurious creg interrupt!\n");
return;
}
card->creg_ctrl.creg_stats.stat = ioread32(card->regmap + CREG_STAT);
cmd->status = card->creg_ctrl.creg_stats.stat;
if ((cmd->status & CREG_STAT_STATUS_MASK) == 0) {
dev_err(CARD_TO_DEV(card),
"Invalid status on creg command\n");
/*
* At this point we're probably reading garbage from HW. Don't
* do anything else that could mess up the system and let
* the sync function return an error.
*/
st = -EIO;
goto creg_done;
} else if (cmd->status & CREG_STAT_ERROR) {
st = -EIO;
}
if ((cmd->op == CREG_OP_READ)) {
unsigned int cnt8 = ioread32(card->regmap + CREG_CNT);
/* Paranoid Sanity Checks */
if (!cmd->buf) {
dev_err(CARD_TO_DEV(card),
"Buffer not given for read.\n");
st = -EIO;
goto creg_done;
}
if (cnt8 != cmd->cnt8) {
dev_err(CARD_TO_DEV(card),
"count mismatch\n");
st = -EIO;
goto creg_done;
}
copy_from_creg_data(card, cnt8, cmd->buf, cmd->stream);
}
creg_done:
if (cmd->cb)
cmd->cb(card, cmd, st);
kmem_cache_free(creg_cmd_pool, cmd);
spin_lock(&card->creg_ctrl.lock);
card->creg_ctrl.active = 0;
creg_kick_queue(card);
spin_unlock(&card->creg_ctrl.lock);
}
static void creg_reset(struct rsxx_cardinfo *card)
{
struct creg_cmd *cmd = NULL;
struct creg_cmd *tmp;
unsigned long flags;
/*
* mutex_trylock is used here because if reset_lock is taken then a
* reset is already happening. So, we can just go ahead and return.
*/
if (!mutex_trylock(&card->creg_ctrl.reset_lock))
return;
card->creg_ctrl.reset = 1;
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_disable_ier_and_isr(card, CR_INTR_CREG | CR_INTR_EVENT);
spin_unlock_irqrestore(&card->irq_lock, flags);
dev_warn(CARD_TO_DEV(card),
"Resetting creg interface for recovery\n");
/* Cancel outstanding commands */
spin_lock(&card->creg_ctrl.lock);
list_for_each_entry_safe(cmd, tmp, &card->creg_ctrl.queue, list) {
list_del(&cmd->list);
card->creg_ctrl.q_depth--;
if (cmd->cb)
cmd->cb(card, cmd, -ECANCELED);
kmem_cache_free(creg_cmd_pool, cmd);
}
cmd = card->creg_ctrl.active_cmd;
card->creg_ctrl.active_cmd = NULL;
if (cmd) {
if (timer_pending(&card->creg_ctrl.cmd_timer))
del_timer_sync(&card->creg_ctrl.cmd_timer);
if (cmd->cb)
cmd->cb(card, cmd, -ECANCELED);
kmem_cache_free(creg_cmd_pool, cmd);
card->creg_ctrl.active = 0;
}
spin_unlock(&card->creg_ctrl.lock);
card->creg_ctrl.reset = 0;
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_enable_ier_and_isr(card, CR_INTR_CREG | CR_INTR_EVENT);
spin_unlock_irqrestore(&card->irq_lock, flags);
mutex_unlock(&card->creg_ctrl.reset_lock);
}
/* Used for synchronous accesses */
struct creg_completion {
struct completion *cmd_done;
int st;
u32 creg_status;
};
static void creg_cmd_done_cb(struct rsxx_cardinfo *card,
struct creg_cmd *cmd,
int st)
{
struct creg_completion *cmd_completion;
cmd_completion = cmd->cb_private;
BUG_ON(!cmd_completion);
cmd_completion->st = st;
cmd_completion->creg_status = cmd->status;
complete(cmd_completion->cmd_done);
}
static int __issue_creg_rw(struct rsxx_cardinfo *card,
unsigned int op,
unsigned int addr,
unsigned int cnt8,
void *buf,
int stream,
unsigned int *hw_stat)
{
DECLARE_COMPLETION_ONSTACK(cmd_done);
struct creg_completion completion;
unsigned long timeout;
int st;
completion.cmd_done = &cmd_done;
completion.st = 0;
completion.creg_status = 0;
st = creg_queue_cmd(card, op, addr, cnt8, buf, stream, creg_cmd_done_cb,
&completion);
if (st)
return st;
/*
* This timeout is neccessary for unresponsive hardware. The additional
* 20 seconds to used to guarantee that each cregs requests has time to
* complete.
*/
timeout = msecs_to_jiffies((CREG_TIMEOUT_MSEC *
card->creg_ctrl.q_depth) + 20000);
/*
* The creg interface is guaranteed to complete. It has a timeout
* mechanism that will kick in if hardware does not respond.
*/
st = wait_for_completion_timeout(completion.cmd_done, timeout);
if (st == 0) {
/*
* This is really bad, because the kernel timer did not
* expire and notify us of a timeout!
*/
dev_crit(CARD_TO_DEV(card),
"cregs timer failed\n");
creg_reset(card);
return -EIO;
}
*hw_stat = completion.creg_status;
if (completion.st) {
dev_warn(CARD_TO_DEV(card),
"creg command failed(%d x%08x)\n",
completion.st, addr);
return completion.st;
}
return 0;
}
static int issue_creg_rw(struct rsxx_cardinfo *card,
u32 addr,
unsigned int size8,
void *data,
int stream,
int read)
{
unsigned int hw_stat;
unsigned int xfer;
unsigned int op;
int st;
op = read ? CREG_OP_READ : CREG_OP_WRITE;
do {
xfer = min_t(unsigned int, size8, MAX_CREG_DATA8);
st = __issue_creg_rw(card, op, addr, xfer,
data, stream, &hw_stat);
if (st)
return st;
data = (char *)data + xfer;
addr += xfer;
size8 -= xfer;
} while (size8);
return 0;
}
/* ---------------------------- Public API ---------------------------------- */
int rsxx_creg_write(struct rsxx_cardinfo *card,
u32 addr,
unsigned int size8,
void *data,
int byte_stream)
{
return issue_creg_rw(card, addr, size8, data, byte_stream, 0);
}
int rsxx_creg_read(struct rsxx_cardinfo *card,
u32 addr,
unsigned int size8,
void *data,
int byte_stream)
{
return issue_creg_rw(card, addr, size8, data, byte_stream, 1);
}
int rsxx_get_card_state(struct rsxx_cardinfo *card, unsigned int *state)
{
return rsxx_creg_read(card, CREG_ADD_CARD_STATE,
sizeof(*state), state, 0);
}
int rsxx_get_card_size8(struct rsxx_cardinfo *card, u64 *size8)
{
unsigned int size;
int st;
st = rsxx_creg_read(card, CREG_ADD_CARD_SIZE,
sizeof(size), &size, 0);
if (st)
return st;
*size8 = (u64)size * RSXX_HW_BLK_SIZE;
return 0;
}
int rsxx_get_num_targets(struct rsxx_cardinfo *card,
unsigned int *n_targets)
{
return rsxx_creg_read(card, CREG_ADD_NUM_TARGETS,
sizeof(*n_targets), n_targets, 0);
}
int rsxx_get_card_capabilities(struct rsxx_cardinfo *card,
u32 *capabilities)
{
return rsxx_creg_read(card, CREG_ADD_CAPABILITIES,
sizeof(*capabilities), capabilities, 0);
}
int rsxx_issue_card_cmd(struct rsxx_cardinfo *card, u32 cmd)
{
return rsxx_creg_write(card, CREG_ADD_CARD_CMD,
sizeof(cmd), &cmd, 0);
}
/*----------------- HW Log Functions -------------------*/
static void hw_log_msg(struct rsxx_cardinfo *card, const char *str, int len)
{
static char level;
/*
* New messages start with "<#>", where # is the log level. Messages
* that extend past the log buffer will use the previous level
*/
if ((len > 3) && (str[0] == '<') && (str[2] == '>')) {
level = str[1];
str += 3; /* Skip past the log level. */
len -= 3;
}
switch (level) {
case '0':
dev_emerg(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
case '1':
dev_alert(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
case '2':
dev_crit(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
case '3':
dev_err(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
case '4':
dev_warn(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
case '5':
dev_notice(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
case '6':
dev_info(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
case '7':
dev_dbg(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
default:
dev_info(CARD_TO_DEV(card), "HW: %.*s", len, str);
break;
}
}
/*
* The substrncpy function copies the src string (which includes the
* terminating '\0' character), up to the count into the dest pointer.
* Returns the number of bytes copied to dest.
*/
static int substrncpy(char *dest, const char *src, int count)
{
int max_cnt = count;
while (count) {
count--;
*dest = *src;
if (*dest == '\0')
break;
src++;
dest++;
}
return max_cnt - count;
}
static void read_hw_log_done(struct rsxx_cardinfo *card,
struct creg_cmd *cmd,
int st)
{
char *buf;
char *log_str;
int cnt;
int len;
int off;
buf = cmd->buf;
off = 0;
/* Failed getting the log message */
if (st)
return;
while (off < cmd->cnt8) {
log_str = &card->log.buf[card->log.buf_len];
cnt = min(cmd->cnt8 - off, LOG_BUF_SIZE8 - card->log.buf_len);
len = substrncpy(log_str, &buf[off], cnt);
off += len;
card->log.buf_len += len;
/*
* Flush the log if we've hit the end of a message or if we've
* run out of buffer space.
*/
if ((log_str[len - 1] == '\0') ||
(card->log.buf_len == LOG_BUF_SIZE8)) {
if (card->log.buf_len != 1) /* Don't log blank lines. */
hw_log_msg(card, card->log.buf,
card->log.buf_len);
card->log.buf_len = 0;
}
}
if (cmd->status & CREG_STAT_LOG_PENDING)
rsxx_read_hw_log(card);
}
int rsxx_read_hw_log(struct rsxx_cardinfo *card)
{
int st;
st = creg_queue_cmd(card, CREG_OP_READ, CREG_ADD_LOG,
sizeof(card->log.tmp), card->log.tmp,
1, read_hw_log_done, NULL);
if (st)
dev_err(CARD_TO_DEV(card),
"Failed getting log text\n");
return st;
}
/*-------------- IOCTL REG Access ------------------*/
static int issue_reg_cmd(struct rsxx_cardinfo *card,
struct rsxx_reg_access *cmd,
int read)
{
unsigned int op = read ? CREG_OP_READ : CREG_OP_WRITE;
return __issue_creg_rw(card, op, cmd->addr, cmd->cnt, cmd->data,
cmd->stream, &cmd->stat);
}
int rsxx_reg_access(struct rsxx_cardinfo *card,
struct rsxx_reg_access __user *ucmd,
int read)
{
struct rsxx_reg_access cmd;
int st;
st = copy_from_user(&cmd, ucmd, sizeof(cmd));
if (st)
return -EFAULT;
if (cmd.cnt > RSXX_MAX_REG_CNT)
return -EFAULT;
st = issue_reg_cmd(card, &cmd, read);
if (st)
return st;
st = put_user(cmd.stat, &ucmd->stat);
if (st)
return -EFAULT;
if (read) {
st = copy_to_user(ucmd->data, cmd.data, cmd.cnt);
if (st)
return -EFAULT;
}
return 0;
}
/*------------ Initialization & Setup --------------*/
int rsxx_creg_setup(struct rsxx_cardinfo *card)
{
card->creg_ctrl.active_cmd = NULL;
INIT_WORK(&card->creg_ctrl.done_work, creg_cmd_done);
mutex_init(&card->creg_ctrl.reset_lock);
INIT_LIST_HEAD(&card->creg_ctrl.queue);
spin_lock_init(&card->creg_ctrl.lock);
setup_timer(&card->creg_ctrl.cmd_timer, creg_cmd_timed_out,
(unsigned long) card);
return 0;
}
void rsxx_creg_destroy(struct rsxx_cardinfo *card)
{
struct creg_cmd *cmd;
struct creg_cmd *tmp;
int cnt = 0;
/* Cancel outstanding commands */
spin_lock(&card->creg_ctrl.lock);
list_for_each_entry_safe(cmd, tmp, &card->creg_ctrl.queue, list) {
list_del(&cmd->list);
if (cmd->cb)
cmd->cb(card, cmd, -ECANCELED);
kmem_cache_free(creg_cmd_pool, cmd);
cnt++;
}
if (cnt)
dev_info(CARD_TO_DEV(card),
"Canceled %d queue creg commands\n", cnt);
cmd = card->creg_ctrl.active_cmd;
card->creg_ctrl.active_cmd = NULL;
if (cmd) {
if (timer_pending(&card->creg_ctrl.cmd_timer))
del_timer_sync(&card->creg_ctrl.cmd_timer);
if (cmd->cb)
cmd->cb(card, cmd, -ECANCELED);
dev_info(CARD_TO_DEV(card),
"Canceled active creg command\n");
kmem_cache_free(creg_cmd_pool, cmd);
}
spin_unlock(&card->creg_ctrl.lock);
cancel_work_sync(&card->creg_ctrl.done_work);
}
int rsxx_creg_init(void)
{
creg_cmd_pool = KMEM_CACHE(creg_cmd, SLAB_HWCACHE_ALIGN);
if (!creg_cmd_pool)
return -ENOMEM;
return 0;
}
void rsxx_creg_cleanup(void)
{
kmem_cache_destroy(creg_cmd_pool);
}
drivers/block/rsxx/dev.c 0 → 100644
View file @ f042fea0
/*
* Filename: dev.c
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/hdreg.h>
#include <linux/genhd.h>
#include <linux/blkdev.h>
#include <linux/bio.h>
#include <linux/fs.h>
#include "rsxx_priv.h"
static unsigned int blkdev_minors = 64;
module_param(blkdev_minors, uint, 0444);
MODULE_PARM_DESC(blkdev_minors, "Number of minors(partitions)");
/*
* For now I'm making this tweakable in case any applications hit this limit.
* If you see a "bio too big" error in the log you will need to raise this
* value.
*/
static unsigned int blkdev_max_hw_sectors = 1024;
module_param(blkdev_max_hw_sectors, uint, 0444);
MODULE_PARM_DESC(blkdev_max_hw_sectors, "Max hw sectors for a single BIO");
static unsigned int enable_blkdev = 1;
module_param(enable_blkdev , uint, 0444);
MODULE_PARM_DESC(enable_blkdev, "Enable block device interfaces");
struct rsxx_bio_meta {
struct bio *bio;
atomic_t pending_dmas;
atomic_t error;
unsigned long start_time;
};
static struct kmem_cache *bio_meta_pool;
/*----------------- Block Device Operations -----------------*/
static int rsxx_blkdev_ioctl(struct block_device *bdev,
fmode_t mode,
unsigned int cmd,
unsigned long arg)
{
struct rsxx_cardinfo *card = bdev->bd_disk->private_data;
switch (cmd) {
case RSXX_GETREG:
return rsxx_reg_access(card, (void __user *)arg, 1);
case RSXX_SETREG:
return rsxx_reg_access(card, (void __user *)arg, 0);
}
return -ENOTTY;
}
static int rsxx_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct rsxx_cardinfo *card = bdev->bd_disk->private_data;
u64 blocks = card->size8 >> 9;
/*
* get geometry: Fake it. I haven't found any drivers that set
* geo->start, so we won't either.
*/
if (card->size8) {
geo->heads = 64;
geo->sectors = 16;
do_div(blocks, (geo->heads * geo->sectors));
geo->cylinders = blocks;
} else {
geo->heads = 0;
geo->sectors = 0;
geo->cylinders = 0;
}
return 0;
}
static const struct block_device_operations rsxx_fops = {
.owner = THIS_MODULE,
.getgeo = rsxx_getgeo,
.ioctl = rsxx_blkdev_ioctl,
};
static void disk_stats_start(struct rsxx_cardinfo *card, struct bio *bio)
{
struct hd_struct *part0 = &card->gendisk->part0;
int rw = bio_data_dir(bio);
int cpu;
cpu = part_stat_lock();
part_round_stats(cpu, part0);
part_inc_in_flight(part0, rw);
part_stat_unlock();
}
static void disk_stats_complete(struct rsxx_cardinfo *card,
struct bio *bio,
unsigned long start_time)
{
struct hd_struct *part0 = &card->gendisk->part0;
unsigned long duration = jiffies - start_time;
int rw = bio_data_dir(bio);
int cpu;
cpu = part_stat_lock();
part_stat_add(cpu, part0, sectors[rw], bio_sectors(bio));
part_stat_inc(cpu, part0, ios[rw]);
part_stat_add(cpu, part0, ticks[rw], duration);
part_round_stats(cpu, part0);
part_dec_in_flight(part0, rw);
part_stat_unlock();
}
static void bio_dma_done_cb(struct rsxx_cardinfo *card,
void *cb_data,
unsigned int error)
{
struct rsxx_bio_meta *meta = cb_data;
if (error)
atomic_set(&meta->error, 1);
if (atomic_dec_and_test(&meta->pending_dmas)) {
disk_stats_complete(card, meta->bio, meta->start_time);
bio_endio(meta->bio, atomic_read(&meta->error) ? -EIO : 0);
kmem_cache_free(bio_meta_pool, meta);
}
}
static void rsxx_make_request(struct request_queue *q, struct bio *bio)
{
struct rsxx_cardinfo *card = q->queuedata;
struct rsxx_bio_meta *bio_meta;
int st = -EINVAL;
might_sleep();
if (unlikely(card->halt)) {
st = -EFAULT;
goto req_err;
}
if (unlikely(card->dma_fault)) {
st = (-EFAULT);
goto req_err;
}
if (bio->bi_size == 0) {
dev_err(CARD_TO_DEV(card), "size zero BIO!\n");
goto req_err;
}
bio_meta = kmem_cache_alloc(bio_meta_pool, GFP_KERNEL);
if (!bio_meta) {
st = -ENOMEM;
goto req_err;
}
bio_meta->bio = bio;
atomic_set(&bio_meta->error, 0);
atomic_set(&bio_meta->pending_dmas, 0);
bio_meta->start_time = jiffies;
disk_stats_start(card, bio);
dev_dbg(CARD_TO_DEV(card), "BIO[%c]: meta: %p addr8: x%llx size: %d\n",
bio_data_dir(bio) ? 'W' : 'R', bio_meta,
(u64)bio->bi_sector << 9, bio->bi_size);
st = rsxx_dma_queue_bio(card, bio, &bio_meta->pending_dmas,
bio_dma_done_cb, bio_meta);
if (st)
goto queue_err;
return;
queue_err:
kmem_cache_free(bio_meta_pool, bio_meta);
req_err:
bio_endio(bio, st);
}
/*----------------- Device Setup -------------------*/
static bool rsxx_discard_supported(struct rsxx_cardinfo *card)
{
unsigned char pci_rev;
pci_read_config_byte(card->dev, PCI_REVISION_ID, &pci_rev);
return (pci_rev >= RSXX_DISCARD_SUPPORT);
}
static unsigned short rsxx_get_logical_block_size(
struct rsxx_cardinfo *card)
{
u32 capabilities = 0;
int st;
st = rsxx_get_card_capabilities(card, &capabilities);
if (st)
dev_warn(CARD_TO_DEV(card),
"Failed reading card capabilities register\n");
/* Earlier firmware did not have support for 512 byte accesses */
if (capabilities & CARD_CAP_SUBPAGE_WRITES)
return 512;
else
return RSXX_HW_BLK_SIZE;
}
int rsxx_attach_dev(struct rsxx_cardinfo *card)
{
mutex_lock(&card->dev_lock);
/* The block device requires the stripe size from the config. */
if (enable_blkdev) {
if (card->config_valid)
set_capacity(card->gendisk, card->size8 >> 9);
else
set_capacity(card->gendisk, 0);
add_disk(card->gendisk);
card->bdev_attached = 1;
}
mutex_unlock(&card->dev_lock);
return 0;
}
void rsxx_detach_dev(struct rsxx_cardinfo *card)
{
mutex_lock(&card->dev_lock);
if (card->bdev_attached) {
del_gendisk(card->gendisk);
card->bdev_attached = 0;
}
mutex_unlock(&card->dev_lock);
}
int rsxx_setup_dev(struct rsxx_cardinfo *card)
{
unsigned short blk_size;
mutex_init(&card->dev_lock);
if (!enable_blkdev)
return 0;
card->major = register_blkdev(0, DRIVER_NAME);
if (card->major < 0) {
dev_err(CARD_TO_DEV(card), "Failed to get major number\n");
return -ENOMEM;
}
card->queue = blk_alloc_queue(GFP_KERNEL);
if (!card->queue) {
dev_err(CARD_TO_DEV(card), "Failed queue alloc\n");
unregister_blkdev(card->major, DRIVER_NAME);
return -ENOMEM;
}
card->gendisk = alloc_disk(blkdev_minors);
if (!card->gendisk) {
dev_err(CARD_TO_DEV(card), "Failed disk alloc\n");
blk_cleanup_queue(card->queue);
unregister_blkdev(card->major, DRIVER_NAME);
return -ENOMEM;
}
blk_size = rsxx_get_logical_block_size(card);
blk_queue_make_request(card->queue, rsxx_make_request);
blk_queue_bounce_limit(card->queue, BLK_BOUNCE_ANY);
blk_queue_dma_alignment(card->queue, blk_size - 1);
blk_queue_max_hw_sectors(card->queue, blkdev_max_hw_sectors);
blk_queue_logical_block_size(card->queue, blk_size);
blk_queue_physical_block_size(card->queue, RSXX_HW_BLK_SIZE);
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, card->queue);
if (rsxx_discard_supported(card)) {
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, card->queue);
blk_queue_max_discard_sectors(card->queue,
RSXX_HW_BLK_SIZE >> 9);
card->queue->limits.discard_granularity = RSXX_HW_BLK_SIZE;
card->queue->limits.discard_alignment = RSXX_HW_BLK_SIZE;
card->queue->limits.discard_zeroes_data = 1;
}
card->queue->queuedata = card;
snprintf(card->gendisk->disk_name, sizeof(card->gendisk->disk_name),
"rsxx%d", card->disk_id);
card->gendisk->driverfs_dev = &card->dev->dev;
card->gendisk->major = card->major;
card->gendisk->first_minor = 0;
card->gendisk->fops = &rsxx_fops;
card->gendisk->private_data = card;
card->gendisk->queue = card->queue;
return 0;
}
void rsxx_destroy_dev(struct rsxx_cardinfo *card)
{
if (!enable_blkdev)
return;
put_disk(card->gendisk);
card->gendisk = NULL;
blk_cleanup_queue(card->queue);
unregister_blkdev(card->major, DRIVER_NAME);
}
int rsxx_dev_init(void)
{
bio_meta_pool = KMEM_CACHE(rsxx_bio_meta, SLAB_HWCACHE_ALIGN);
if (!bio_meta_pool)
return -ENOMEM;
return 0;
}
void rsxx_dev_cleanup(void)
{
kmem_cache_destroy(bio_meta_pool);
}
drivers/block/rsxx/dma.c 0 → 100644
View file @ f042fea0
/*
* Filename: dma.c
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/slab.h>
#include "rsxx_priv.h"
struct rsxx_dma {
struct list_head list;
u8 cmd;
unsigned int laddr; /* Logical address on the ramsan */
struct {
u32 off;
u32 cnt;
} sub_page;
dma_addr_t dma_addr;
struct page *page;
unsigned int pg_off; /* Page Offset */
rsxx_dma_cb cb;
void *cb_data;
};
/* This timeout is used to detect a stalled DMA channel */
#define DMA_ACTIVITY_TIMEOUT msecs_to_jiffies(10000)
struct hw_status {
u8 status;
u8 tag;
__le16 count;
__le32 _rsvd2;
__le64 _rsvd3;
} __packed;
enum rsxx_dma_status {
DMA_SW_ERR = 0x1,
DMA_HW_FAULT = 0x2,
DMA_CANCELLED = 0x4,
};
struct hw_cmd {
u8 command;
u8 tag;
u8 _rsvd;
u8 sub_page; /* Bit[0:2]: 512byte offset */
/* Bit[4:6]: 512byte count */
__le32 device_addr;
__le64 host_addr;
} __packed;
enum rsxx_hw_cmd {
HW_CMD_BLK_DISCARD = 0x70,
HW_CMD_BLK_WRITE = 0x80,
HW_CMD_BLK_READ = 0xC0,
HW_CMD_BLK_RECON_READ = 0xE0,
};
enum rsxx_hw_status {
HW_STATUS_CRC = 0x01,
HW_STATUS_HARD_ERR = 0x02,
HW_STATUS_SOFT_ERR = 0x04,
HW_STATUS_FAULT = 0x08,
};
#define STATUS_BUFFER_SIZE8 4096
#define COMMAND_BUFFER_SIZE8 4096
static struct kmem_cache *rsxx_dma_pool;
struct dma_tracker {
int next_tag;
struct rsxx_dma *dma;
};
#define DMA_TRACKER_LIST_SIZE8 (sizeof(struct dma_tracker_list) + \
(sizeof(struct dma_tracker) * RSXX_MAX_OUTSTANDING_CMDS))
struct dma_tracker_list {
spinlock_t lock;
int head;
struct dma_tracker list[0];
};
/*----------------- Misc Utility Functions -------------------*/
static unsigned int rsxx_addr8_to_laddr(u64 addr8, struct rsxx_cardinfo *card)
{
unsigned long long tgt_addr8;
tgt_addr8 = ((addr8 >> card->_stripe.upper_shift) &
card->_stripe.upper_mask) |
((addr8) & card->_stripe.lower_mask);
do_div(tgt_addr8, RSXX_HW_BLK_SIZE);
return tgt_addr8;
}
static unsigned int rsxx_get_dma_tgt(struct rsxx_cardinfo *card, u64 addr8)
{
unsigned int tgt;
tgt = (addr8 >> card->_stripe.target_shift) & card->_stripe.target_mask;
return tgt;
}
static void rsxx_dma_queue_reset(struct rsxx_cardinfo *card)
{
/* Reset all DMA Command/Status Queues */
iowrite32(DMA_QUEUE_RESET, card->regmap + RESET);
}
static unsigned int get_dma_size(struct rsxx_dma *dma)
{
if (dma->sub_page.cnt)
return dma->sub_page.cnt << 9;
else
return RSXX_HW_BLK_SIZE;
}
/*----------------- DMA Tracker -------------------*/
static void set_tracker_dma(struct dma_tracker_list *trackers,
int tag,
struct rsxx_dma *dma)
{
trackers->list[tag].dma = dma;
}
static struct rsxx_dma *get_tracker_dma(struct dma_tracker_list *trackers,
int tag)
{
return trackers->list[tag].dma;
}
static int pop_tracker(struct dma_tracker_list *trackers)
{
int tag;
spin_lock(&trackers->lock);
tag = trackers->head;
if (tag != -1) {
trackers->head = trackers->list[tag].next_tag;
trackers->list[tag].next_tag = -1;
}
spin_unlock(&trackers->lock);
return tag;
}
static void push_tracker(struct dma_tracker_list *trackers, int tag)
{
spin_lock(&trackers->lock);
trackers->list[tag].next_tag = trackers->head;
trackers->head = tag;
trackers->list[tag].dma = NULL;
spin_unlock(&trackers->lock);
}
/*----------------- Interrupt Coalescing -------------*/
/*
* Interrupt Coalescing Register Format:
* Interrupt Timer (64ns units) [15:0]
* Interrupt Count [24:16]
* Reserved [31:25]
*/
#define INTR_COAL_LATENCY_MASK (0x0000ffff)
#define INTR_COAL_COUNT_SHIFT 16
#define INTR_COAL_COUNT_BITS 9
#define INTR_COAL_COUNT_MASK (((1 << INTR_COAL_COUNT_BITS) - 1) << \
INTR_COAL_COUNT_SHIFT)
#define INTR_COAL_LATENCY_UNITS_NS 64
static u32 dma_intr_coal_val(u32 mode, u32 count, u32 latency)
{
u32 latency_units = latency / INTR_COAL_LATENCY_UNITS_NS;
if (mode == RSXX_INTR_COAL_DISABLED)
return 0;
return ((count << INTR_COAL_COUNT_SHIFT) & INTR_COAL_COUNT_MASK) |
(latency_units & INTR_COAL_LATENCY_MASK);
}
static void dma_intr_coal_auto_tune(struct rsxx_cardinfo *card)
{
int i;
u32 q_depth = 0;
u32 intr_coal;
if (card->config.data.intr_coal.mode != RSXX_INTR_COAL_AUTO_TUNE)
return;
for (i = 0; i < card->n_targets; i++)
q_depth += atomic_read(&card->ctrl[i].stats.hw_q_depth);
intr_coal = dma_intr_coal_val(card->config.data.intr_coal.mode,
q_depth / 2,
card->config.data.intr_coal.latency);
iowrite32(intr_coal, card->regmap + INTR_COAL);
}
/*----------------- RSXX DMA Handling -------------------*/
static void rsxx_complete_dma(struct rsxx_cardinfo *card,
struct rsxx_dma *dma,
unsigned int status)
{
if (status & DMA_SW_ERR)
printk_ratelimited(KERN_ERR
"SW Error in DMA(cmd x%02x, laddr x%08x)\n",
dma->cmd, dma->laddr);
if (status & DMA_HW_FAULT)
printk_ratelimited(KERN_ERR
"HW Fault in DMA(cmd x%02x, laddr x%08x)\n",
dma->cmd, dma->laddr);
if (status & DMA_CANCELLED)
printk_ratelimited(KERN_ERR
"DMA Cancelled(cmd x%02x, laddr x%08x)\n",
dma->cmd, dma->laddr);
if (dma->dma_addr)
pci_unmap_page(card->dev, dma->dma_addr, get_dma_size(dma),
dma->cmd == HW_CMD_BLK_WRITE ?
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
if (dma->cb)
dma->cb(card, dma->cb_data, status ? 1 : 0);
kmem_cache_free(rsxx_dma_pool, dma);
}
static void rsxx_requeue_dma(struct rsxx_dma_ctrl *ctrl,
struct rsxx_dma *dma)
{
/*
* Requeued DMAs go to the front of the queue so they are issued
* first.
*/
spin_lock(&ctrl->queue_lock);
list_add(&dma->list, &ctrl->queue);
spin_unlock(&ctrl->queue_lock);
}
static void rsxx_handle_dma_error(struct rsxx_dma_ctrl *ctrl,
struct rsxx_dma *dma,
u8 hw_st)
{
unsigned int status = 0;
int requeue_cmd = 0;
dev_dbg(CARD_TO_DEV(ctrl->card),
"Handling DMA error(cmd x%02x, laddr x%08x st:x%02x)\n",
dma->cmd, dma->laddr, hw_st);
if (hw_st & HW_STATUS_CRC)
ctrl->stats.crc_errors++;
if (hw_st & HW_STATUS_HARD_ERR)
ctrl->stats.hard_errors++;
if (hw_st & HW_STATUS_SOFT_ERR)
ctrl->stats.soft_errors++;
switch (dma->cmd) {
case HW_CMD_BLK_READ:
if (hw_st & (HW_STATUS_CRC | HW_STATUS_HARD_ERR)) {
if (ctrl->card->scrub_hard) {
dma->cmd = HW_CMD_BLK_RECON_READ;
requeue_cmd = 1;
ctrl->stats.reads_retried++;
} else {
status |= DMA_HW_FAULT;
ctrl->stats.reads_failed++;
}
} else if (hw_st & HW_STATUS_FAULT) {
status |= DMA_HW_FAULT;
ctrl->stats.reads_failed++;
}
break;
case HW_CMD_BLK_RECON_READ:
if (hw_st & (HW_STATUS_CRC | HW_STATUS_HARD_ERR)) {
/* Data could not be reconstructed. */
status |= DMA_HW_FAULT;
ctrl->stats.reads_failed++;
}
break;
case HW_CMD_BLK_WRITE:
status |= DMA_HW_FAULT;
ctrl->stats.writes_failed++;
break;
case HW_CMD_BLK_DISCARD:
status |= DMA_HW_FAULT;
ctrl->stats.discards_failed++;
break;
default:
dev_err(CARD_TO_DEV(ctrl->card),
"Unknown command in DMA!(cmd: x%02x "
"laddr x%08x st: x%02x\n",
dma->cmd, dma->laddr, hw_st);
status |= DMA_SW_ERR;
break;
}
if (requeue_cmd)
rsxx_requeue_dma(ctrl, dma);
else
rsxx_complete_dma(ctrl->card, dma, status);
}
static void dma_engine_stalled(unsigned long data)
{
struct rsxx_dma_ctrl *ctrl = (struct rsxx_dma_ctrl *)data;
if (atomic_read(&ctrl->stats.hw_q_depth) == 0)
return;
if (ctrl->cmd.idx != ioread32(ctrl->regmap + SW_CMD_IDX)) {
/*
* The dma engine was stalled because the SW_CMD_IDX write
* was lost. Issue it again to recover.
*/
dev_warn(CARD_TO_DEV(ctrl->card),
"SW_CMD_IDX write was lost, re-writing...\n");
iowrite32(ctrl->cmd.idx, ctrl->regmap + SW_CMD_IDX);
mod_timer(&ctrl->activity_timer,
jiffies + DMA_ACTIVITY_TIMEOUT);
} else {
dev_warn(CARD_TO_DEV(ctrl->card),
"DMA channel %d has stalled, faulting interface.\n",
ctrl->id);
ctrl->card->dma_fault = 1;
}
}
static void rsxx_issue_dmas(struct work_struct *work)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
int tag;
int cmds_pending = 0;
struct hw_cmd *hw_cmd_buf;
ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work);
hw_cmd_buf = ctrl->cmd.buf;
if (unlikely(ctrl->card->halt))
return;
while (1) {
spin_lock(&ctrl->queue_lock);
if (list_empty(&ctrl->queue)) {
spin_unlock(&ctrl->queue_lock);
break;
}
spin_unlock(&ctrl->queue_lock);
tag = pop_tracker(ctrl->trackers);
if (tag == -1)
break;
spin_lock(&ctrl->queue_lock);
dma = list_entry(ctrl->queue.next, struct rsxx_dma, list);
list_del(&dma->list);
ctrl->stats.sw_q_depth--;
spin_unlock(&ctrl->queue_lock);
/*
* This will catch any DMAs that slipped in right before the
* fault, but was queued after all the other DMAs were
* cancelled.
*/
if (unlikely(ctrl->card->dma_fault)) {
push_tracker(ctrl->trackers, tag);
rsxx_complete_dma(ctrl->card, dma, DMA_CANCELLED);
continue;
}
set_tracker_dma(ctrl->trackers, tag, dma);
hw_cmd_buf[ctrl->cmd.idx].command = dma->cmd;
hw_cmd_buf[ctrl->cmd.idx].tag = tag;
hw_cmd_buf[ctrl->cmd.idx]._rsvd = 0;
hw_cmd_buf[ctrl->cmd.idx].sub_page =
((dma->sub_page.cnt & 0x7) << 4) |
(dma->sub_page.off & 0x7);
hw_cmd_buf[ctrl->cmd.idx].device_addr =
cpu_to_le32(dma->laddr);
hw_cmd_buf[ctrl->cmd.idx].host_addr =
cpu_to_le64(dma->dma_addr);
dev_dbg(CARD_TO_DEV(ctrl->card),
"Issue DMA%d(laddr %d tag %d) to idx %d\n",
ctrl->id, dma->laddr, tag, ctrl->cmd.idx);
ctrl->cmd.idx = (ctrl->cmd.idx + 1) & RSXX_CS_IDX_MASK;
cmds_pending++;
if (dma->cmd == HW_CMD_BLK_WRITE)
ctrl->stats.writes_issued++;
else if (dma->cmd == HW_CMD_BLK_DISCARD)
ctrl->stats.discards_issued++;
else
ctrl->stats.reads_issued++;
}
/* Let HW know we've queued commands. */
if (cmds_pending) {
/*
* We must guarantee that the CPU writes to 'ctrl->cmd.buf'
* (which is in PCI-consistent system-memory) from the loop
* above make it into the coherency domain before the
* following PIO "trigger" updating the cmd.idx. A WMB is
* sufficient. We need not explicitly CPU cache-flush since
* the memory is a PCI-consistent (ie; coherent) mapping.
*/
wmb();
atomic_add(cmds_pending, &ctrl->stats.hw_q_depth);
mod_timer(&ctrl->activity_timer,
jiffies + DMA_ACTIVITY_TIMEOUT);
iowrite32(ctrl->cmd.idx, ctrl->regmap + SW_CMD_IDX);
}
}
static void rsxx_dma_done(struct work_struct *work)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
unsigned long flags;
u16 count;
u8 status;
u8 tag;
struct hw_status *hw_st_buf;
ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work);
hw_st_buf = ctrl->status.buf;
if (unlikely(ctrl->card->halt) ||
unlikely(ctrl->card->dma_fault))
return;
count = le16_to_cpu(hw_st_buf[ctrl->status.idx].count);
while (count == ctrl->e_cnt) {
/*
* The read memory-barrier is necessary to keep aggressive
* processors/optimizers (such as the PPC Apple G5) from
* reordering the following status-buffer tag & status read
* *before* the count read on subsequent iterations of the
* loop!
*/
rmb();
status = hw_st_buf[ctrl->status.idx].status;
tag = hw_st_buf[ctrl->status.idx].tag;
dma = get_tracker_dma(ctrl->trackers, tag);
if (dma == NULL) {
spin_lock_irqsave(&ctrl->card->irq_lock, flags);
rsxx_disable_ier(ctrl->card, CR_INTR_DMA_ALL);
spin_unlock_irqrestore(&ctrl->card->irq_lock, flags);
dev_err(CARD_TO_DEV(ctrl->card),
"No tracker for tag %d "
"(idx %d id %d)\n",
tag, ctrl->status.idx, ctrl->id);
return;
}
dev_dbg(CARD_TO_DEV(ctrl->card),
"Completing DMA%d"
"(laddr x%x tag %d st: x%x cnt: x%04x) from idx %d.\n",
ctrl->id, dma->laddr, tag, status, count,
ctrl->status.idx);
atomic_dec(&ctrl->stats.hw_q_depth);
mod_timer(&ctrl->activity_timer,
jiffies + DMA_ACTIVITY_TIMEOUT);
if (status)
rsxx_handle_dma_error(ctrl, dma, status);
else
rsxx_complete_dma(ctrl->card, dma, 0);
push_tracker(ctrl->trackers, tag);
ctrl->status.idx = (ctrl->status.idx + 1) &
RSXX_CS_IDX_MASK;
ctrl->e_cnt++;
count = le16_to_cpu(hw_st_buf[ctrl->status.idx].count);
}
dma_intr_coal_auto_tune(ctrl->card);
if (atomic_read(&ctrl->stats.hw_q_depth) == 0)
del_timer_sync(&ctrl->activity_timer);
spin_lock_irqsave(&ctrl->card->irq_lock, flags);
rsxx_enable_ier(ctrl->card, CR_INTR_DMA(ctrl->id));
spin_unlock_irqrestore(&ctrl->card->irq_lock, flags);
spin_lock(&ctrl->queue_lock);
if (ctrl->stats.sw_q_depth)
queue_work(ctrl->issue_wq, &ctrl->issue_dma_work);
spin_unlock(&ctrl->queue_lock);
}
static int rsxx_cleanup_dma_queue(struct rsxx_cardinfo *card,
struct list_head *q)
{
struct rsxx_dma *dma;
struct rsxx_dma *tmp;
int cnt = 0;
list_for_each_entry_safe(dma, tmp, q, list) {
list_del(&dma->list);
if (dma->dma_addr)
pci_unmap_page(card->dev, dma->dma_addr,
get_dma_size(dma),
(dma->cmd == HW_CMD_BLK_WRITE) ?
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
kmem_cache_free(rsxx_dma_pool, dma);
cnt++;
}
return cnt;
}
static int rsxx_queue_discard(struct rsxx_cardinfo *card,
struct list_head *q,
unsigned int laddr,
rsxx_dma_cb cb,
void *cb_data)
{
struct rsxx_dma *dma;
dma = kmem_cache_alloc(rsxx_dma_pool, GFP_KERNEL);
if (!dma)
return -ENOMEM;
dma->cmd = HW_CMD_BLK_DISCARD;
dma->laddr = laddr;
dma->dma_addr = 0;
dma->sub_page.off = 0;
dma->sub_page.cnt = 0;
dma->page = NULL;
dma->pg_off = 0;
dma->cb = cb;
dma->cb_data = cb_data;
dev_dbg(CARD_TO_DEV(card), "Queuing[D] laddr %x\n", dma->laddr);
list_add_tail(&dma->list, q);
return 0;
}
static int rsxx_queue_dma(struct rsxx_cardinfo *card,
struct list_head *q,
int dir,
unsigned int dma_off,
unsigned int dma_len,
unsigned int laddr,
struct page *page,
unsigned int pg_off,
rsxx_dma_cb cb,
void *cb_data)
{
struct rsxx_dma *dma;
dma = kmem_cache_alloc(rsxx_dma_pool, GFP_KERNEL);
if (!dma)
return -ENOMEM;
dma->dma_addr = pci_map_page(card->dev, page, pg_off, dma_len,
dir ? PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
if (!dma->dma_addr) {
kmem_cache_free(rsxx_dma_pool, dma);
return -ENOMEM;
}
dma->cmd = dir ? HW_CMD_BLK_WRITE : HW_CMD_BLK_READ;
dma->laddr = laddr;
dma->sub_page.off = (dma_off >> 9);
dma->sub_page.cnt = (dma_len >> 9);
dma->page = page;
dma->pg_off = pg_off;
dma->cb = cb;
dma->cb_data = cb_data;
dev_dbg(CARD_TO_DEV(card),
"Queuing[%c] laddr %x off %d cnt %d page %p pg_off %d\n",
dir ? 'W' : 'R', dma->laddr, dma->sub_page.off,
dma->sub_page.cnt, dma->page, dma->pg_off);
/* Queue the DMA */
list_add_tail(&dma->list, q);
return 0;
}
int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
struct bio *bio,
atomic_t *n_dmas,
rsxx_dma_cb cb,
void *cb_data)
{
struct list_head dma_list[RSXX_MAX_TARGETS];
struct bio_vec *bvec;
unsigned long long addr8;
unsigned int laddr;
unsigned int bv_len;
unsigned int bv_off;
unsigned int dma_off;
unsigned int dma_len;
int dma_cnt[RSXX_MAX_TARGETS];
int tgt;
int st;
int i;
addr8 = bio->bi_sector << 9; /* sectors are 512 bytes */
atomic_set(n_dmas, 0);
for (i = 0; i < card->n_targets; i++) {
INIT_LIST_HEAD(&dma_list[i]);
dma_cnt[i] = 0;
}
if (bio->bi_rw & REQ_DISCARD) {
bv_len = bio->bi_size;
while (bv_len > 0) {
tgt = rsxx_get_dma_tgt(card, addr8);
laddr = rsxx_addr8_to_laddr(addr8, card);
st = rsxx_queue_discard(card, &dma_list[tgt], laddr,
cb, cb_data);
if (st)
goto bvec_err;
dma_cnt[tgt]++;
atomic_inc(n_dmas);
addr8 += RSXX_HW_BLK_SIZE;
bv_len -= RSXX_HW_BLK_SIZE;
}
} else {
bio_for_each_segment(bvec, bio, i) {
bv_len = bvec->bv_len;
bv_off = bvec->bv_offset;
while (bv_len > 0) {
tgt = rsxx_get_dma_tgt(card, addr8);
laddr = rsxx_addr8_to_laddr(addr8, card);
dma_off = addr8 & RSXX_HW_BLK_MASK;
dma_len = min(bv_len,
RSXX_HW_BLK_SIZE - dma_off);
st = rsxx_queue_dma(card, &dma_list[tgt],
bio_data_dir(bio),
dma_off, dma_len,
laddr, bvec->bv_page,
bv_off, cb, cb_data);
if (st)
goto bvec_err;
dma_cnt[tgt]++;
atomic_inc(n_dmas);
addr8 += dma_len;
bv_off += dma_len;
bv_len -= dma_len;
}
}
}
for (i = 0; i < card->n_targets; i++) {
if (!list_empty(&dma_list[i])) {
spin_lock(&card->ctrl[i].queue_lock);
card->ctrl[i].stats.sw_q_depth += dma_cnt[i];
list_splice_tail(&dma_list[i], &card->ctrl[i].queue);
spin_unlock(&card->ctrl[i].queue_lock);
queue_work(card->ctrl[i].issue_wq,
&card->ctrl[i].issue_dma_work);
}
}
return 0;
bvec_err:
for (i = 0; i < card->n_targets; i++)
rsxx_cleanup_dma_queue(card, &dma_list[i]);
return st;
}
/*----------------- DMA Engine Initialization & Setup -------------------*/
static int rsxx_dma_ctrl_init(struct pci_dev *dev,
struct rsxx_dma_ctrl *ctrl)
{
int i;
memset(&ctrl->stats, 0, sizeof(ctrl->stats));
ctrl->status.buf = pci_alloc_consistent(dev, STATUS_BUFFER_SIZE8,
&ctrl->status.dma_addr);
ctrl->cmd.buf = pci_alloc_consistent(dev, COMMAND_BUFFER_SIZE8,
&ctrl->cmd.dma_addr);
if (ctrl->status.buf == NULL || ctrl->cmd.buf == NULL)
return -ENOMEM;
ctrl->trackers = vmalloc(DMA_TRACKER_LIST_SIZE8);
if (!ctrl->trackers)
return -ENOMEM;
ctrl->trackers->head = 0;
for (i = 0; i < RSXX_MAX_OUTSTANDING_CMDS; i++) {
ctrl->trackers->list[i].next_tag = i + 1;
ctrl->trackers->list[i].dma = NULL;
}
ctrl->trackers->list[RSXX_MAX_OUTSTANDING_CMDS-1].next_tag = -1;
spin_lock_init(&ctrl->trackers->lock);
spin_lock_init(&ctrl->queue_lock);
INIT_LIST_HEAD(&ctrl->queue);
setup_timer(&ctrl->activity_timer, dma_engine_stalled,
(unsigned long)ctrl);
ctrl->issue_wq = alloc_ordered_workqueue(DRIVER_NAME"_issue", 0);
if (!ctrl->issue_wq)
return -ENOMEM;
ctrl->done_wq = alloc_ordered_workqueue(DRIVER_NAME"_done", 0);
if (!ctrl->done_wq)
return -ENOMEM;
INIT_WORK(&ctrl->issue_dma_work, rsxx_issue_dmas);
INIT_WORK(&ctrl->dma_done_work, rsxx_dma_done);
memset(ctrl->status.buf, 0xac, STATUS_BUFFER_SIZE8);
iowrite32(lower_32_bits(ctrl->status.dma_addr),
ctrl->regmap + SB_ADD_LO);
iowrite32(upper_32_bits(ctrl->status.dma_addr),
ctrl->regmap + SB_ADD_HI);
memset(ctrl->cmd.buf, 0x83, COMMAND_BUFFER_SIZE8);
iowrite32(lower_32_bits(ctrl->cmd.dma_addr), ctrl->regmap + CB_ADD_LO);
iowrite32(upper_32_bits(ctrl->cmd.dma_addr), ctrl->regmap + CB_ADD_HI);
ctrl->status.idx = ioread32(ctrl->regmap + HW_STATUS_CNT);
if (ctrl->status.idx > RSXX_MAX_OUTSTANDING_CMDS) {
dev_crit(&dev->dev, "Failed reading status cnt x%x\n",
ctrl->status.idx);
return -EINVAL;
}
iowrite32(ctrl->status.idx, ctrl->regmap + HW_STATUS_CNT);
iowrite32(ctrl->status.idx, ctrl->regmap + SW_STATUS_CNT);
ctrl->cmd.idx = ioread32(ctrl->regmap + HW_CMD_IDX);
if (ctrl->cmd.idx > RSXX_MAX_OUTSTANDING_CMDS) {
dev_crit(&dev->dev, "Failed reading cmd cnt x%x\n",
ctrl->status.idx);
return -EINVAL;
}
iowrite32(ctrl->cmd.idx, ctrl->regmap + HW_CMD_IDX);
iowrite32(ctrl->cmd.idx, ctrl->regmap + SW_CMD_IDX);
wmb();
return 0;
}
static int rsxx_dma_stripe_setup(struct rsxx_cardinfo *card,
unsigned int stripe_size8)
{
if (!is_power_of_2(stripe_size8)) {
dev_err(CARD_TO_DEV(card),
"stripe_size is NOT a power of 2!\n");
return -EINVAL;
}
card->_stripe.lower_mask = stripe_size8 - 1;
card->_stripe.upper_mask = ~(card->_stripe.lower_mask);
card->_stripe.upper_shift = ffs(card->n_targets) - 1;
card->_stripe.target_mask = card->n_targets - 1;
card->_stripe.target_shift = ffs(stripe_size8) - 1;
dev_dbg(CARD_TO_DEV(card), "_stripe.lower_mask = x%016llx\n",
card->_stripe.lower_mask);
dev_dbg(CARD_TO_DEV(card), "_stripe.upper_shift = x%016llx\n",
card->_stripe.upper_shift);
dev_dbg(CARD_TO_DEV(card), "_stripe.upper_mask = x%016llx\n",
card->_stripe.upper_mask);
dev_dbg(CARD_TO_DEV(card), "_stripe.target_mask = x%016llx\n",
card->_stripe.target_mask);
dev_dbg(CARD_TO_DEV(card), "_stripe.target_shift = x%016llx\n",
card->_stripe.target_shift);
return 0;
}
static int rsxx_dma_configure(struct rsxx_cardinfo *card)
{
u32 intr_coal;
intr_coal = dma_intr_coal_val(card->config.data.intr_coal.mode,
card->config.data.intr_coal.count,
card->config.data.intr_coal.latency);
iowrite32(intr_coal, card->regmap + INTR_COAL);
return rsxx_dma_stripe_setup(card, card->config.data.stripe_size);
}
int rsxx_dma_setup(struct rsxx_cardinfo *card)
{
unsigned long flags;
int st;
int i;
dev_info(CARD_TO_DEV(card),
"Initializing %d DMA targets\n",
card->n_targets);
/* Regmap is divided up into 4K chunks. One for each DMA channel */
for (i = 0; i < card->n_targets; i++)
card->ctrl[i].regmap = card->regmap + (i * 4096);
card->dma_fault = 0;
/* Reset the DMA queues */
rsxx_dma_queue_reset(card);
/************* Setup DMA Control *************/
for (i = 0; i < card->n_targets; i++) {
st = rsxx_dma_ctrl_init(card->dev, &card->ctrl[i]);
if (st)
goto failed_dma_setup;
card->ctrl[i].card = card;
card->ctrl[i].id = i;
}
card->scrub_hard = 1;
if (card->config_valid)
rsxx_dma_configure(card);
/* Enable the interrupts after all setup has completed. */
for (i = 0; i < card->n_targets; i++) {
spin_lock_irqsave(&card->irq_lock, flags);
rsxx_enable_ier_and_isr(card, CR_INTR_DMA(i));
spin_unlock_irqrestore(&card->irq_lock, flags);
}
return 0;
failed_dma_setup:
for (i = 0; i < card->n_targets; i++) {
struct rsxx_dma_ctrl *ctrl = &card->ctrl[i];
if (ctrl->issue_wq) {
destroy_workqueue(ctrl->issue_wq);
ctrl->issue_wq = NULL;
}
if (ctrl->done_wq) {
destroy_workqueue(ctrl->done_wq);
ctrl->done_wq = NULL;
}
if (ctrl->trackers)
vfree(ctrl->trackers);
if (ctrl->status.buf)
pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
ctrl->status.buf,
ctrl->status.dma_addr);
if (ctrl->cmd.buf)
pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
ctrl->cmd.buf, ctrl->cmd.dma_addr);
}
return st;
}
void rsxx_dma_destroy(struct rsxx_cardinfo *card)
{
struct rsxx_dma_ctrl *ctrl;
struct rsxx_dma *dma;
int i, j;
int cnt = 0;
for (i = 0; i < card->n_targets; i++) {
ctrl = &card->ctrl[i];
if (ctrl->issue_wq) {
destroy_workqueue(ctrl->issue_wq);
ctrl->issue_wq = NULL;
}
if (ctrl->done_wq) {
destroy_workqueue(ctrl->done_wq);
ctrl->done_wq = NULL;
}
if (timer_pending(&ctrl->activity_timer))
del_timer_sync(&ctrl->activity_timer);
/* Clean up the DMA queue */
spin_lock(&ctrl->queue_lock);
cnt = rsxx_cleanup_dma_queue(card, &ctrl->queue);
spin_unlock(&ctrl->queue_lock);
if (cnt)
dev_info(CARD_TO_DEV(card),
"Freed %d queued DMAs on channel %d\n",
cnt, i);
/* Clean up issued DMAs */
for (j = 0; j < RSXX_MAX_OUTSTANDING_CMDS; j++) {
dma = get_tracker_dma(ctrl->trackers, j);
if (dma) {
pci_unmap_page(card->dev, dma->dma_addr,
get_dma_size(dma),
(dma->cmd == HW_CMD_BLK_WRITE) ?
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
kmem_cache_free(rsxx_dma_pool, dma);
cnt++;
}
}
if (cnt)
dev_info(CARD_TO_DEV(card),
"Freed %d pending DMAs on channel %d\n",
cnt, i);
vfree(ctrl->trackers);
pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
ctrl->status.buf, ctrl->status.dma_addr);
pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
ctrl->cmd.buf, ctrl->cmd.dma_addr);
}
}
int rsxx_dma_init(void)
{
rsxx_dma_pool = KMEM_CACHE(rsxx_dma, SLAB_HWCACHE_ALIGN);
if (!rsxx_dma_pool)
return -ENOMEM;
return 0;
}
void rsxx_dma_cleanup(void)
{
kmem_cache_destroy(rsxx_dma_pool);
}
drivers/block/rsxx/rsxx.h 0 → 100644
View file @ f042fea0
/*
* Filename: rsxx.h
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __RSXX_H__
#define __RSXX_H__
/*----------------- IOCTL Definitions -------------------*/
struct rsxx_reg_access {
__u32 addr;
__u32 cnt;
__u32 stat;
__u32 stream;
__u32 data[8];
};
#define RSXX_MAX_REG_CNT (8 * (sizeof(__u32)))
#define RSXX_IOC_MAGIC 'r'
#define RSXX_GETREG _IOWR(RSXX_IOC_MAGIC, 0x20, struct rsxx_reg_access)
#define RSXX_SETREG _IOWR(RSXX_IOC_MAGIC, 0x21, struct rsxx_reg_access)
#endif /* __RSXX_H_ */
drivers/block/rsxx/rsxx_cfg.h 0 → 100644
View file @ f042fea0
/*
* Filename: rsXX_cfg.h
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __RSXX_CFG_H__
#define __RSXX_CFG_H__
/* NOTE: Config values will be saved in network byte order (i.e. Big endian) */
#include <linux/types.h>
/*
* The card config version must match the driver's expected version. If it does
* not, the DMA interfaces will not be attached and the user will need to
* initialize/upgrade the card configuration using the card config utility.
*/
#define RSXX_CFG_VERSION 4
struct card_cfg_hdr {
__u32 version;
__u32 crc;
};
struct card_cfg_data {
__u32 block_size;
__u32 stripe_size;
__u32 vendor_id;
__u32 cache_order;
struct {
__u32 mode; /* Disabled, manual, auto-tune... */
__u32 count; /* Number of intr to coalesce */
__u32 latency;/* Max wait time (in ns) */
} intr_coal;
};
struct rsxx_card_cfg {
struct card_cfg_hdr hdr;
struct card_cfg_data data;
};
/* Vendor ID Values */
#define RSXX_VENDOR_ID_TMS_IBM 0
#define RSXX_VENDOR_ID_DSI 1
#define RSXX_VENDOR_COUNT 2
/* Interrupt Coalescing Values */
#define RSXX_INTR_COAL_DISABLED 0
#define RSXX_INTR_COAL_EXPLICIT 1
#define RSXX_INTR_COAL_AUTO_TUNE 2
#endif /* __RSXX_CFG_H__ */
drivers/block/rsxx/rsxx_priv.h 0 → 100644
View file @ f042fea0
/*
* Filename: rsxx_priv.h
*
*
* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
*
* (C) Copyright 2013 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __RSXX_PRIV_H__
#define __RSXX_PRIV_H__
#include <linux/version.h>
#include <linux/semaphore.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/sysfs.h>
#include <linux/workqueue.h>
#include <linux/bio.h>
#include <linux/vmalloc.h>
#include <linux/timer.h>
#include <linux/ioctl.h>
#include "rsxx.h"
#include "rsxx_cfg.h"
struct proc_cmd;
#define PCI_VENDOR_ID_TMS_IBM 0x15B6
#define PCI_DEVICE_ID_RS70_FLASH 0x0019
#define PCI_DEVICE_ID_RS70D_FLASH 0x001A
#define PCI_DEVICE_ID_RS80_FLASH 0x001C
#define PCI_DEVICE_ID_RS81_FLASH 0x001E
#define RS70_PCI_REV_SUPPORTED 4
#define DRIVER_NAME "rsxx"
#define DRIVER_VERSION "3.7"
/* Block size is 4096 */
#define RSXX_HW_BLK_SHIFT 12
#define RSXX_HW_BLK_SIZE (1 << RSXX_HW_BLK_SHIFT)
#define RSXX_HW_BLK_MASK (RSXX_HW_BLK_SIZE - 1)
#define MAX_CREG_DATA8 32
#define LOG_BUF_SIZE8 128
#define RSXX_MAX_OUTSTANDING_CMDS 255
#define RSXX_CS_IDX_MASK 0xff
#define RSXX_MAX_TARGETS 8
struct dma_tracker_list;
/* DMA Command/Status Buffer structure */
struct rsxx_cs_buffer {
dma_addr_t dma_addr;
void *buf;
u32 idx;
};
struct rsxx_dma_stats {
u32 crc_errors;
u32 hard_errors;
u32 soft_errors;
u32 writes_issued;
u32 writes_failed;
u32 reads_issued;
u32 reads_failed;
u32 reads_retried;
u32 discards_issued;
u32 discards_failed;
u32 done_rescheduled;
u32 issue_rescheduled;
u32 sw_q_depth; /* Number of DMAs on the SW queue. */
atomic_t hw_q_depth; /* Number of DMAs queued to HW. */
};
struct rsxx_dma_ctrl {
struct rsxx_cardinfo *card;
int id;
void __iomem *regmap;
struct rsxx_cs_buffer status;
struct rsxx_cs_buffer cmd;
u16 e_cnt;
spinlock_t queue_lock;
struct list_head queue;
struct workqueue_struct *issue_wq;
struct work_struct issue_dma_work;
struct workqueue_struct *done_wq;
struct work_struct dma_done_work;
struct timer_list activity_timer;
struct dma_tracker_list *trackers;
struct rsxx_dma_stats stats;
};
struct rsxx_cardinfo {
struct pci_dev *dev;
unsigned int halt;
void __iomem *regmap;
spinlock_t irq_lock;
unsigned int isr_mask;
unsigned int ier_mask;
struct rsxx_card_cfg config;
int config_valid;
/* Embedded CPU Communication */
struct {
spinlock_t lock;
bool active;
struct creg_cmd *active_cmd;
struct work_struct done_work;
struct list_head queue;
unsigned int q_depth;
/* Cache the creg status to prevent ioreads */
struct {
u32 stat;
u32 failed_cancel_timer;
u32 creg_timeout;
} creg_stats;
struct timer_list cmd_timer;
struct mutex reset_lock;
int reset;
} creg_ctrl;
struct {
char tmp[MAX_CREG_DATA8];
char buf[LOG_BUF_SIZE8]; /* terminated */
int buf_len;
} log;
struct work_struct event_work;
unsigned int state;
u64 size8;
/* Lock the device attach/detach function */
struct mutex dev_lock;
/* Block Device Variables */
bool bdev_attached;
int disk_id;
int major;
struct request_queue *queue;
struct gendisk *gendisk;
struct {
/* Used to convert a byte address to a device address. */
u64 lower_mask;
u64 upper_shift;
u64 upper_mask;
u64 target_mask;
u64 target_shift;
} _stripe;
unsigned int dma_fault;
int scrub_hard;
int n_targets;
struct rsxx_dma_ctrl *ctrl;
};
enum rsxx_pci_regmap {
HWID = 0x00, /* Hardware Identification Register */
SCRATCH = 0x04, /* Scratch/Debug Register */
RESET = 0x08, /* Reset Register */
ISR = 0x10, /* Interrupt Status Register */
IER = 0x14, /* Interrupt Enable Register */
IPR = 0x18, /* Interrupt Poll Register */
CB_ADD_LO = 0x20, /* Command Host Buffer Address [31:0] */
CB_ADD_HI = 0x24, /* Command Host Buffer Address [63:32]*/
HW_CMD_IDX = 0x28, /* Hardware Processed Command Index */
SW_CMD_IDX = 0x2C, /* Software Processed Command Index */
SB_ADD_LO = 0x30, /* Status Host Buffer Address [31:0] */
SB_ADD_HI = 0x34, /* Status Host Buffer Address [63:32] */
HW_STATUS_CNT = 0x38, /* Hardware Status Counter */
SW_STATUS_CNT = 0x3C, /* Deprecated */
CREG_CMD = 0x40, /* CPU Command Register */
CREG_ADD = 0x44, /* CPU Address Register */
CREG_CNT = 0x48, /* CPU Count Register */
CREG_STAT = 0x4C, /* CPU Status Register */
CREG_DATA0 = 0x50, /* CPU Data Registers */
CREG_DATA1 = 0x54,
CREG_DATA2 = 0x58,
CREG_DATA3 = 0x5C,
CREG_DATA4 = 0x60,
CREG_DATA5 = 0x64,
CREG_DATA6 = 0x68,
CREG_DATA7 = 0x6c,
INTR_COAL = 0x70, /* Interrupt Coalescing Register */
HW_ERROR = 0x74, /* Card Error Register */
PCI_DEBUG0 = 0x78, /* PCI Debug Registers */
PCI_DEBUG1 = 0x7C,
PCI_DEBUG2 = 0x80,
PCI_DEBUG3 = 0x84,
PCI_DEBUG4 = 0x88,
PCI_DEBUG5 = 0x8C,
PCI_DEBUG6 = 0x90,
PCI_DEBUG7 = 0x94,
PCI_POWER_THROTTLE = 0x98,
PERF_CTRL = 0x9c,
PERF_TIMER_LO = 0xa0,
PERF_TIMER_HI = 0xa4,
PERF_RD512_LO = 0xa8,
PERF_RD512_HI = 0xac,
PERF_WR512_LO = 0xb0,
PERF_WR512_HI = 0xb4,
};
enum rsxx_intr {
CR_INTR_DMA0 = 0x00000001,
CR_INTR_CREG = 0x00000002,
CR_INTR_DMA1 = 0x00000004,
CR_INTR_EVENT = 0x00000008,
CR_INTR_DMA2 = 0x00000010,
CR_INTR_DMA3 = 0x00000020,
CR_INTR_DMA4 = 0x00000040,
CR_INTR_DMA5 = 0x00000080,
CR_INTR_DMA6 = 0x00000100,
CR_INTR_DMA7 = 0x00000200,
CR_INTR_DMA_ALL = 0x000003f5,
CR_INTR_ALL = 0xffffffff,
};
static inline int CR_INTR_DMA(int N)
{
static const unsigned int _CR_INTR_DMA[] = {
CR_INTR_DMA0, CR_INTR_DMA1, CR_INTR_DMA2, CR_INTR_DMA3,
CR_INTR_DMA4, CR_INTR_DMA5, CR_INTR_DMA6, CR_INTR_DMA7
};
return _CR_INTR_DMA[N];
}
enum rsxx_pci_reset {
DMA_QUEUE_RESET = 0x00000001,
};
enum rsxx_pci_revision {
RSXX_DISCARD_SUPPORT = 2,
};
enum rsxx_creg_cmd {
CREG_CMD_TAG_MASK = 0x0000FF00,
CREG_OP_WRITE = 0x000000C0,
CREG_OP_READ = 0x000000E0,
};
enum rsxx_creg_addr {
CREG_ADD_CARD_CMD = 0x80001000,
CREG_ADD_CARD_STATE = 0x80001004,
CREG_ADD_CARD_SIZE = 0x8000100c,
CREG_ADD_CAPABILITIES = 0x80001050,
CREG_ADD_LOG = 0x80002000,
CREG_ADD_NUM_TARGETS = 0x80003000,
CREG_ADD_CONFIG = 0xB0000000,
};
enum rsxx_creg_card_cmd {
CARD_CMD_STARTUP = 1,
CARD_CMD_SHUTDOWN = 2,
CARD_CMD_LOW_LEVEL_FORMAT = 3,
CARD_CMD_FPGA_RECONFIG_BR = 4,
CARD_CMD_FPGA_RECONFIG_MAIN = 5,
CARD_CMD_BACKUP = 6,
CARD_CMD_RESET = 7,
CARD_CMD_deprecated = 8,
CARD_CMD_UNINITIALIZE = 9,
CARD_CMD_DSTROY_EMERGENCY = 10,
CARD_CMD_DSTROY_NORMAL = 11,
CARD_CMD_DSTROY_EXTENDED = 12,
CARD_CMD_DSTROY_ABORT = 13,
};
enum rsxx_card_state {
CARD_STATE_SHUTDOWN = 0x00000001,
CARD_STATE_STARTING = 0x00000002,
CARD_STATE_FORMATTING = 0x00000004,
CARD_STATE_UNINITIALIZED = 0x00000008,
CARD_STATE_GOOD = 0x00000010,
CARD_STATE_SHUTTING_DOWN = 0x00000020,
CARD_STATE_FAULT = 0x00000040,
CARD_STATE_RD_ONLY_FAULT = 0x00000080,
CARD_STATE_DSTROYING = 0x00000100,
};
enum rsxx_led {
LED_DEFAULT = 0x0,
LED_IDENTIFY = 0x1,
LED_SOAK = 0x2,
};
enum rsxx_creg_flash_lock {
CREG_FLASH_LOCK = 1,
CREG_FLASH_UNLOCK = 2,
};
enum rsxx_card_capabilities {
CARD_CAP_SUBPAGE_WRITES = 0x00000080,
};
enum rsxx_creg_stat {
CREG_STAT_STATUS_MASK = 0x00000003,
CREG_STAT_SUCCESS = 0x1,
CREG_STAT_ERROR = 0x2,
CREG_STAT_CHAR_PENDING = 0x00000004, /* Character I/O pending bit */
CREG_STAT_LOG_PENDING = 0x00000008, /* HW log message pending bit */
CREG_STAT_TAG_MASK = 0x0000ff00,
};
static inline unsigned int CREG_DATA(int N)
{
return CREG_DATA0 + (N << 2);
}
/*----------------- Convenient Log Wrappers -------------------*/
#define CARD_TO_DEV(__CARD) (&(__CARD)->dev->dev)
/***** config.c *****/
int rsxx_load_config(struct rsxx_cardinfo *card);
/***** core.c *****/
void rsxx_enable_ier(struct rsxx_cardinfo *card, unsigned int intr);
void rsxx_disable_ier(struct rsxx_cardinfo *card, unsigned int intr);
void rsxx_enable_ier_and_isr(struct rsxx_cardinfo *card,
unsigned int intr);
void rsxx_disable_ier_and_isr(struct rsxx_cardinfo *card,
unsigned int intr);
/***** dev.c *****/
int rsxx_attach_dev(struct rsxx_cardinfo *card);
void rsxx_detach_dev(struct rsxx_cardinfo *card);
int rsxx_setup_dev(struct rsxx_cardinfo *card);
void rsxx_destroy_dev(struct rsxx_cardinfo *card);
int rsxx_dev_init(void);
void rsxx_dev_cleanup(void);
/***** dma.c ****/
typedef void (*rsxx_dma_cb)(struct rsxx_cardinfo *card,
void *cb_data,
unsigned int status);
int rsxx_dma_setup(struct rsxx_cardinfo *card);
void rsxx_dma_destroy(struct rsxx_cardinfo *card);
int rsxx_dma_init(void);
void rsxx_dma_cleanup(void);
int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
struct bio *bio,
atomic_t *n_dmas,
rsxx_dma_cb cb,
void *cb_data);
/***** cregs.c *****/
int rsxx_creg_write(struct rsxx_cardinfo *card, u32 addr,
unsigned int size8,
void *data,
int byte_stream);
int rsxx_creg_read(struct rsxx_cardinfo *card,
u32 addr,
unsigned int size8,
void *data,
int byte_stream);
int rsxx_read_hw_log(struct rsxx_cardinfo *card);
int rsxx_get_card_state(struct rsxx_cardinfo *card,
unsigned int *state);
int rsxx_get_card_size8(struct rsxx_cardinfo *card, u64 *size8);
int rsxx_get_num_targets(struct rsxx_cardinfo *card,
unsigned int *n_targets);
int rsxx_get_card_capabilities(struct rsxx_cardinfo *card,
u32 *capabilities);
int rsxx_issue_card_cmd(struct rsxx_cardinfo *card, u32 cmd);
int rsxx_creg_setup(struct rsxx_cardinfo *card);
void rsxx_creg_destroy(struct rsxx_cardinfo *card);
int rsxx_creg_init(void);
void rsxx_creg_cleanup(void);
int rsxx_reg_access(struct rsxx_cardinfo *card,
struct rsxx_reg_access __user *ucmd,
int read);
#endif /* __DRIVERS_BLOCK_RSXX_H__ */
drivers/block/xd.c deleted 100644 → 0
View file @ ee89f812
/*
* This file contains the driver for an XT hard disk controller
* (at least the DTC 5150X) for Linux.
*
* Author: Pat Mackinlay, pat@it.com.au
* Date: 29/09/92
*
* Revised: 01/01/93, ...
*
* Ref: DTC 5150X Controller Specification (thanks to Kevin Fowler,
* kevinf@agora.rain.com)
* Also thanks to: Salvador Abreu, Dave Thaler, Risto Kankkunen and
* Wim Van Dorst.
*
* Revised: 04/04/94 by Risto Kankkunen
* Moved the detection code from xd_init() to xd_geninit() as it needed
* interrupts enabled and Linus didn't want to enable them in that first
* phase. xd_geninit() is the place to do these kinds of things anyway,
* he says.
*
* Modularized: 04/10/96 by Todd Fries, tfries@umr.edu
*
* Revised: 13/12/97 by Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl
* Fixed some problems with disk initialization and module initiation.
* Added support for manual geometry setting (except Seagate controllers)
* in form:
* xd_geo=<cyl_xda>,<head_xda>,<sec_xda>[,<cyl_xdb>,<head_xdb>,<sec_xdb>]
* Recovered DMA access. Abridged messages. Added support for DTC5051CX,
* WD1002-27X & XEBEC controllers. Driver uses now some jumper settings.
* Extended ioctl() support.
*
* Bugfix: 15/02/01, Paul G. - inform queue layer of tiny xd_maxsect.
*
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/genhd.h>
#include <linux/hdreg.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/blkpg.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/gfp.h>
#include <asm/uaccess.h>
#include <asm/dma.h>
#include "xd.h"
static DEFINE_MUTEX(xd_mutex);
static void __init do_xd_setup (int *integers);
#ifdef MODULE
static int xd[5] = { -1,-1,-1,-1, };
#endif
#define XD_DONT_USE_DMA 0 /* Initial value. may be overriden using
"nodma" module option */
#define XD_INIT_DISK_DELAY (30) /* 30 ms delay during disk initialization */
/* Above may need to be increased if a problem with the 2nd drive detection
(ST11M controller) or resetting a controller (WD) appears */
static XD_INFO xd_info[XD_MAXDRIVES];
/* If you try this driver and find that your card is not detected by the driver at bootup, you need to add your BIOS
signature and details to the following list of signatures. A BIOS signature is a string embedded into the first
few bytes of your controller's on-board ROM BIOS. To find out what yours is, use something like MS-DOS's DEBUG
command. Run DEBUG, and then you can examine your BIOS signature with:
d xxxx:0000
where xxxx is the segment of your controller (like C800 or D000 or something). On the ASCII dump at the right, you should
be able to see a string mentioning the manufacturer's copyright etc. Add this string into the table below. The parameters
in the table are, in order:
offset ; this is the offset (in bytes) from the start of your ROM where the signature starts
signature ; this is the actual text of the signature
xd_?_init_controller ; this is the controller init routine used by your controller
xd_?_init_drive ; this is the drive init routine used by your controller
The controllers directly supported at the moment are: DTC 5150x, WD 1004A27X, ST11M/R and override. If your controller is
made by the same manufacturer as one of these, try using the same init routines as they do. If that doesn't work, your
best bet is to use the "override" routines. These routines use a "portable" method of getting the disk's geometry, and
may work with your card. If none of these seem to work, try sending me some email and I'll see what I can do <grin>.
NOTE: You can now specify your XT controller's parameters from the command line in the form xd=TYPE,IRQ,IO,DMA. The driver
should be able to detect your drive's geometry from this info. (eg: xd=0,5,0x320,3 is the "standard"). */
#include <asm/page.h>
#define xd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size))
#define xd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
static char *xd_dma_buffer;
static XD_SIGNATURE xd_sigs[] __initdata = {
{ 0x0000,"Override geometry handler",NULL,xd_override_init_drive,"n unknown" }, /* Pat Mackinlay, pat@it.com.au */
{ 0x0008,"[BXD06 (C) DTC 17-MAY-1985]",xd_dtc_init_controller,xd_dtc5150cx_init_drive," DTC 5150CX" }, /* Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl */
{ 0x000B,"CRD18A Not an IBM rom. (C) Copyright Data Technology Corp. 05/31/88",xd_dtc_init_controller,xd_dtc_init_drive," DTC 5150X" }, /* Todd Fries, tfries@umr.edu */
{ 0x000B,"CXD23A Not an IBM ROM (C)Copyright Data Technology Corp 12/03/88",xd_dtc_init_controller,xd_dtc_init_drive," DTC 5150X" }, /* Pat Mackinlay, pat@it.com.au */
{ 0x0008,"07/15/86(C) Copyright 1986 Western Digital Corp.",xd_wd_init_controller,xd_wd_init_drive," Western Dig. 1002-27X" }, /* Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl */
{ 0x0008,"06/24/88(C) Copyright 1988 Western Digital Corp.",xd_wd_init_controller,xd_wd_init_drive," Western Dig. WDXT-GEN2" }, /* Dan Newcombe, newcombe@aa.csc.peachnet.edu */
{ 0x0015,"SEAGATE ST11 BIOS REVISION",xd_seagate_init_controller,xd_seagate_init_drive," Seagate ST11M/R" }, /* Salvador Abreu, spa@fct.unl.pt */
{ 0x0010,"ST11R BIOS",xd_seagate_init_controller,xd_seagate_init_drive," Seagate ST11M/R" }, /* Risto Kankkunen, risto.kankkunen@cs.helsinki.fi */
{ 0x0010,"ST11 BIOS v1.7",xd_seagate_init_controller,xd_seagate_init_drive," Seagate ST11R" }, /* Alan Hourihane, alanh@fairlite.demon.co.uk */
{ 0x1000,"(c)Copyright 1987 SMS",xd_omti_init_controller,xd_omti_init_drive,"n OMTI 5520" }, /* Dirk Melchers, dirk@merlin.nbg.sub.org */
{ 0x0006,"COPYRIGHT XEBEC (C) 1984",xd_xebec_init_controller,xd_xebec_init_drive," XEBEC" }, /* Andrzej Krzysztofowicz, ankry@mif.pg.gda.pl */
{ 0x0008,"(C) Copyright 1984 Western Digital Corp", xd_wd_init_controller, xd_wd_init_drive," Western Dig. 1002s-wx2" },
{ 0x0008,"(C) Copyright 1986 Western Digital Corporation", xd_wd_init_controller, xd_wd_init_drive," 1986 Western Digital" }, /* jfree@sovereign.org */
};
static unsigned int xd_bases[] __initdata =
{
0xC8000, 0xCA000, 0xCC000,
0xCE000, 0xD0000, 0xD2000,
0xD4000, 0xD6000, 0xD8000,
0xDA000, 0xDC000, 0xDE000,
0xE0000
};
static DEFINE_SPINLOCK(xd_lock);
static struct gendisk *xd_gendisk[2];
static int xd_getgeo(struct block_device *bdev, struct hd_geometry *geo);
static const struct block_device_operations xd_fops = {
.owner = THIS_MODULE,
.ioctl = xd_ioctl,
.getgeo = xd_getgeo,
};
static DECLARE_WAIT_QUEUE_HEAD(xd_wait_int);
static u_char xd_drives, xd_irq = 5, xd_dma = 3, xd_maxsectors;
static u_char xd_override __initdata = 0, xd_type __initdata = 0;
static u_short xd_iobase = 0x320;
static int xd_geo[XD_MAXDRIVES*3] __initdata = { 0, };
static volatile int xdc_busy;
static struct timer_list xd_watchdog_int;
static volatile u_char xd_error;
static bool nodma = XD_DONT_USE_DMA;
static struct request_queue *xd_queue;
/* xd_init: register the block device number and set up pointer tables */
static int __init xd_init(void)
{
u_char i,controller;
unsigned int address;
int err;
#ifdef MODULE
{
u_char count = 0;
for (i = 4; i > 0; i--)
if (((xd[i] = xd[i-1]) >= 0) && !count)
count = i;
if ((xd[0] = count))
do_xd_setup(xd);
}
#endif
init_timer (&xd_watchdog_int); xd_watchdog_int.function = xd_watchdog;
err = -EBUSY;
if (register_blkdev(XT_DISK_MAJOR, "xd"))
goto out1;
err = -ENOMEM;
xd_queue = blk_init_queue(do_xd_request, &xd_lock);
if (!xd_queue)
goto out1a;
if (xd_detect(&controller,&address)) {
printk("Detected a%s controller (type %d) at address %06x\n",
xd_sigs[controller].name,controller,address);
if (!request_region(xd_iobase,4,"xd")) {
printk("xd: Ports at 0x%x are not available\n",
xd_iobase);
goto out2;
}
if (controller)
xd_sigs[controller].init_controller(address);
xd_drives = xd_initdrives(xd_sigs[controller].init_drive);
printk("Detected %d hard drive%s (using IRQ%d & DMA%d)\n",
xd_drives,xd_drives == 1 ? "" : "s",xd_irq,xd_dma);
}
/*
* With the drive detected, xd_maxsectors should now be known.
* If xd_maxsectors is 0, nothing was detected and we fall through
* to return -ENODEV
*/
if (!xd_dma_buffer && xd_maxsectors) {
xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
if (!xd_dma_buffer) {
printk(KERN_ERR "xd: Out of memory.\n");
goto out3;
}
}
err = -ENODEV;
if (!xd_drives)
goto out3;
for (i = 0; i < xd_drives; i++) {
XD_INFO *p = &xd_info[i];
struct gendisk *disk = alloc_disk(64);
if (!disk)
goto Enomem;
p->unit = i;
disk->major = XT_DISK_MAJOR;
disk->first_minor = i<<6;
sprintf(disk->disk_name, "xd%c", i+'a');
disk->fops = &xd_fops;
disk->private_data = p;
disk->queue = xd_queue;
set_capacity(disk, p->heads * p->cylinders * p->sectors);
printk(" %s: CHS=%d/%d/%d\n", disk->disk_name,
p->cylinders, p->heads, p->sectors);
xd_gendisk[i] = disk;
}
err = -EBUSY;
if (request_irq(xd_irq,xd_interrupt_handler, 0, "XT hard disk", NULL)) {
printk("xd: unable to get IRQ%d\n",xd_irq);
goto out4;
}
if (request_dma(xd_dma,"xd")) {
printk("xd: unable to get DMA%d\n",xd_dma);
goto out5;
}
/* xd_maxsectors depends on controller - so set after detection */
blk_queue_max_hw_sectors(xd_queue, xd_maxsectors);
for (i = 0; i < xd_drives; i++)
add_disk(xd_gendisk[i]);
return 0;
out5:
free_irq(xd_irq, NULL);
out4:
for (i = 0; i < xd_drives; i++)
put_disk(xd_gendisk[i]);
out3:
if (xd_maxsectors)
release_region(xd_iobase,4);
if (xd_dma_buffer)
xd_dma_mem_free((unsigned long)xd_dma_buffer,
xd_maxsectors * 0x200);
out2:
blk_cleanup_queue(xd_queue);
out1a:
unregister_blkdev(XT_DISK_MAJOR, "xd");
out1:
return err;
Enomem:
err = -ENOMEM;
while (i--)
put_disk(xd_gendisk[i]);
goto out3;
}
/* xd_detect: scan the possible BIOS ROM locations for the signature strings */
static u_char __init xd_detect (u_char *controller, unsigned int *address)
{
int i, j;
if (xd_override)
{
*controller = xd_type;
*address = 0;
return(1);
}
for (i = 0; i < ARRAY_SIZE(xd_bases); i++) {
void __iomem *p = ioremap(xd_bases[i], 0x2000);
if (!p)
continue;
for (j = 1; j < ARRAY_SIZE(xd_sigs); j++) {
const char *s = xd_sigs[j].string;
if (check_signature(p + xd_sigs[j].offset, s, strlen(s))) {
*controller = j;
xd_type = j;
*address = xd_bases[i];
iounmap(p);
return 1;
}
}
iounmap(p);
}
return 0;
}
/* do_xd_request: handle an incoming request */
static void do_xd_request (struct request_queue * q)
{
struct request *req;
if (xdc_busy)
return;
req = blk_fetch_request(q);
while (req) {
unsigned block = blk_rq_pos(req);
unsigned count = blk_rq_cur_sectors(req);
XD_INFO *disk = req->rq_disk->private_data;
int res = -EIO;
int retry;
if (req->cmd_type != REQ_TYPE_FS)
goto done;
if (block + count > get_capacity(req->rq_disk))
goto done;
for (retry = 0; (retry < XD_RETRIES) && !res; retry++)
res = xd_readwrite(rq_data_dir(req), disk, req->buffer,
block, count);
done:
/* wrap up, 0 = success, -errno = fail */
if (!__blk_end_request_cur(req, res))
req = blk_fetch_request(q);
}
}
static int xd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
XD_INFO *p = bdev->bd_disk->private_data;
geo->heads = p->heads;
geo->sectors = p->sectors;
geo->cylinders = p->cylinders;
return 0;
}
/* xd_ioctl: handle device ioctl's */
static int xd_locked_ioctl(struct block_device *bdev, fmode_t mode, u_int cmd, u_long arg)
{
switch (cmd) {
case HDIO_SET_DMA:
if (!capable(CAP_SYS_ADMIN)) return -EACCES;
if (xdc_busy) return -EBUSY;
nodma = !arg;
if (nodma && xd_dma_buffer) {
xd_dma_mem_free((unsigned long)xd_dma_buffer,
xd_maxsectors * 0x200);
xd_dma_buffer = NULL;
} else if (!nodma && !xd_dma_buffer) {
xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
if (!xd_dma_buffer) {
nodma = XD_DONT_USE_DMA;
return -ENOMEM;
}
}
return 0;
case HDIO_GET_DMA:
return put_user(!nodma, (long __user *) arg);
case HDIO_GET_MULTCOUNT:
return put_user(xd_maxsectors, (long __user *) arg);
default:
return -EINVAL;
}
}
static int xd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long param)
{
int ret;
mutex_lock(&xd_mutex);
ret = xd_locked_ioctl(bdev, mode, cmd, param);
mutex_unlock(&xd_mutex);
return ret;
}
/* xd_readwrite: handle a read/write request */
static int xd_readwrite (u_char operation,XD_INFO *p,char *buffer,u_int block,u_int count)
{
int drive = p->unit;
u_char cmdblk[6],sense[4];
u_short track,cylinder;
u_char head,sector,control,mode = PIO_MODE,temp;
char **real_buffer;
register int i;
#ifdef DEBUG_READWRITE
printk("xd_readwrite: operation = %s, drive = %d, buffer = 0x%X, block = %d, count = %d\n",operation == READ ? "read" : "write",drive,buffer,block,count);
#endif /* DEBUG_READWRITE */
spin_unlock_irq(&xd_lock);
control = p->control;
if (!xd_dma_buffer)
xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
while (count) {
temp = count < xd_maxsectors ? count : xd_maxsectors;
track = block / p->sectors;
head = track % p->heads;
cylinder = track / p->heads;
sector = block % p->sectors;
#ifdef DEBUG_READWRITE
printk("xd_readwrite: drive = %d, head = %d, cylinder = %d, sector = %d, count = %d\n",drive,head,cylinder,sector,temp);
#endif /* DEBUG_READWRITE */
if (xd_dma_buffer) {
mode = xd_setup_dma(operation == READ ? DMA_MODE_READ : DMA_MODE_WRITE,(u_char *)(xd_dma_buffer),temp * 0x200);
real_buffer = &xd_dma_buffer;
for (i=0; i < (temp * 0x200); i++)
xd_dma_buffer[i] = buffer[i];
}
else
real_buffer = &buffer;
xd_build(cmdblk,operation == READ ? CMD_READ : CMD_WRITE,drive,head,cylinder,sector,temp & 0xFF,control);
switch (xd_command(cmdblk,mode,(u_char *)(*real_buffer),(u_char *)(*real_buffer),sense,XD_TIMEOUT)) {
case 1:
printk("xd%c: %s timeout, recalibrating drive\n",'a'+drive,(operation == READ ? "read" : "write"));
xd_recalibrate(drive);
spin_lock_irq(&xd_lock);
return -EIO;
case 2:
if (sense[0] & 0x30) {
printk("xd%c: %s - ",'a'+drive,(operation == READ ? "reading" : "writing"));
switch ((sense[0] & 0x30) >> 4) {
case 0: printk("drive error, code = 0x%X",sense[0] & 0x0F);
break;
case 1: printk("controller error, code = 0x%X",sense[0] & 0x0F);
break;
case 2: printk("command error, code = 0x%X",sense[0] & 0x0F);
break;
case 3: printk("miscellaneous error, code = 0x%X",sense[0] & 0x0F);
break;
}
}
if (sense[0] & 0x80)
printk(" - CHS = %d/%d/%d\n",((sense[2] & 0xC0) << 2) | sense[3],sense[1] & 0x1F,sense[2] & 0x3F);
/* reported drive number = (sense[1] & 0xE0) >> 5 */
else
printk(" - no valid disk address\n");
spin_lock_irq(&xd_lock);
return -EIO;
}
if (xd_dma_buffer)
for (i=0; i < (temp * 0x200); i++)
buffer[i] = xd_dma_buffer[i];
count -= temp, buffer += temp * 0x200, block += temp;
}
spin_lock_irq(&xd_lock);
return 0;
}
/* xd_recalibrate: recalibrate a given drive and reset controller if necessary */
static void xd_recalibrate (u_char drive)
{
u_char cmdblk[6];
xd_build(cmdblk,CMD_RECALIBRATE,drive,0,0,0,0,0);
if (xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT * 8))
printk("xd%c: warning! error recalibrating, controller may be unstable\n", 'a'+drive);
}
/* xd_interrupt_handler: interrupt service routine */
static irqreturn_t xd_interrupt_handler(int irq, void *dev_id)
{
if (inb(XD_STATUS) & STAT_INTERRUPT) { /* check if it was our device */
#ifdef DEBUG_OTHER
printk("xd_interrupt_handler: interrupt detected\n");
#endif /* DEBUG_OTHER */
outb(0,XD_CONTROL); /* acknowledge interrupt */
wake_up(&xd_wait_int); /* and wake up sleeping processes */
return IRQ_HANDLED;
}
else
printk("xd: unexpected interrupt\n");
return IRQ_NONE;
}
/* xd_setup_dma: set up the DMA controller for a data transfer */
static u_char xd_setup_dma (u_char mode,u_char *buffer,u_int count)
{
unsigned long f;
if (nodma)
return (PIO_MODE);
if (((unsigned long) buffer & 0xFFFF0000) != (((unsigned long) buffer + count) & 0xFFFF0000)) {
#ifdef DEBUG_OTHER
printk("xd_setup_dma: using PIO, transfer overlaps 64k boundary\n");
#endif /* DEBUG_OTHER */
return (PIO_MODE);
}
f=claim_dma_lock();
disable_dma(xd_dma);
clear_dma_ff(xd_dma);
set_dma_mode(xd_dma,mode);
set_dma_addr(xd_dma, (unsigned long) buffer);
set_dma_count(xd_dma,count);
release_dma_lock(f);
return (DMA_MODE); /* use DMA and INT */
}
/* xd_build: put stuff into an array in a format suitable for the controller */
static u_char *xd_build (u_char *cmdblk,u_char command,u_char drive,u_char head,u_short cylinder,u_char sector,u_char count,u_char control)
{
cmdblk[0] = command;
cmdblk[1] = ((drive & 0x07) << 5) | (head & 0x1F);
cmdblk[2] = ((cylinder & 0x300) >> 2) | (sector & 0x3F);
cmdblk[3] = cylinder & 0xFF;
cmdblk[4] = count;
cmdblk[5] = control;
return (cmdblk);
}
static void xd_watchdog (unsigned long unused)
{
xd_error = 1;
wake_up(&xd_wait_int);
}
/* xd_waitport: waits until port & mask == flags or a timeout occurs. return 1 for a timeout */
static inline u_char xd_waitport (u_short port,u_char flags,u_char mask,u_long timeout)
{
u_long expiry = jiffies + timeout;
int success;
xdc_busy = 1;
while ((success = ((inb(port) & mask) != flags)) && time_before(jiffies, expiry))
schedule_timeout_uninterruptible(1);
xdc_busy = 0;
return (success);
}
static inline u_int xd_wait_for_IRQ (void)
{
unsigned long flags;
xd_watchdog_int.expires = jiffies + 8 * HZ;
add_timer(&xd_watchdog_int);
flags=claim_dma_lock();
enable_dma(xd_dma);
release_dma_lock(flags);
sleep_on(&xd_wait_int);
del_timer(&xd_watchdog_int);
xdc_busy = 0;
flags=claim_dma_lock();
disable_dma(xd_dma);
release_dma_lock(flags);
if (xd_error) {
printk("xd: missed IRQ - command aborted\n");
xd_error = 0;
return (1);
}
return (0);
}
/* xd_command: handle all data transfers necessary for a single command */
static u_int xd_command (u_char *command,u_char mode,u_char *indata,u_char *outdata,u_char *sense,u_long timeout)
{
u_char cmdblk[6],csb,complete = 0;
#ifdef DEBUG_COMMAND
printk("xd_command: command = 0x%X, mode = 0x%X, indata = 0x%X, outdata = 0x%X, sense = 0x%X\n",command,mode,indata,outdata,sense);
#endif /* DEBUG_COMMAND */
outb(0,XD_SELECT);
outb(mode,XD_CONTROL);
if (xd_waitport(XD_STATUS,STAT_SELECT,STAT_SELECT,timeout))
return (1);
while (!complete) {
if (xd_waitport(XD_STATUS,STAT_READY,STAT_READY,timeout))
return (1);
switch (inb(XD_STATUS) & (STAT_COMMAND | STAT_INPUT)) {
case 0:
if (mode == DMA_MODE) {
if (xd_wait_for_IRQ())
return (1);
} else
outb(outdata ? *outdata++ : 0,XD_DATA);
break;
case STAT_INPUT:
if (mode == DMA_MODE) {
if (xd_wait_for_IRQ())
return (1);
} else
if (indata)
*indata++ = inb(XD_DATA);
else
inb(XD_DATA);
break;
case STAT_COMMAND:
outb(command ? *command++ : 0,XD_DATA);
break;
case STAT_COMMAND | STAT_INPUT:
complete = 1;
break;
}
}
csb = inb(XD_DATA);
if (xd_waitport(XD_STATUS,0,STAT_SELECT,timeout)) /* wait until deselected */
return (1);
if (csb & CSB_ERROR) { /* read sense data if error */
xd_build(cmdblk,CMD_SENSE,(csb & CSB_LUN) >> 5,0,0,0,0,0);
if (xd_command(cmdblk,0,sense,NULL,NULL,XD_TIMEOUT))
printk("xd: warning! sense command failed!\n");
}
#ifdef DEBUG_COMMAND
printk("xd_command: completed with csb = 0x%X\n",csb);
#endif /* DEBUG_COMMAND */
return (csb & CSB_ERROR);
}
static u_char __init xd_initdrives (void (*init_drive)(u_char drive))
{
u_char cmdblk[6],i,count = 0;
for (i = 0; i < XD_MAXDRIVES; i++) {
xd_build(cmdblk,CMD_TESTREADY,i,0,0,0,0,0);
if (!xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT*8)) {
msleep_interruptible(XD_INIT_DISK_DELAY);
init_drive(count);
count++;
msleep_interruptible(XD_INIT_DISK_DELAY);
}
}
return (count);
}
static void __init xd_manual_geo_set (u_char drive)
{
xd_info[drive].heads = (u_char)(xd_geo[3 * drive + 1]);
xd_info[drive].cylinders = (u_short)(xd_geo[3 * drive]);
xd_info[drive].sectors = (u_char)(xd_geo[3 * drive + 2]);
}
static void __init xd_dtc_init_controller (unsigned int address)
{
switch (address) {
case 0x00000:
case 0xC8000: break; /*initial: 0x320 */
case 0xCA000: xd_iobase = 0x324;
case 0xD0000: /*5150CX*/
case 0xD8000: break; /*5150CX & 5150XL*/
default: printk("xd_dtc_init_controller: unsupported BIOS address %06x\n",address);
break;
}
xd_maxsectors = 0x01; /* my card seems to have trouble doing multi-block transfers? */
outb(0,XD_RESET); /* reset the controller */
}
static void __init xd_dtc5150cx_init_drive (u_char drive)
{
/* values from controller's BIOS - BIOS chip may be removed */
static u_short geometry_table[][4] = {
{0x200,8,0x200,0x100},
{0x267,2,0x267,0x267},
{0x264,4,0x264,0x80},
{0x132,4,0x132,0x0},
{0x132,2,0x80, 0x132},
{0x177,8,0x177,0x0},
{0x132,8,0x84, 0x0},
{}, /* not used */
{0x132,6,0x80, 0x100},
{0x200,6,0x100,0x100},
{0x264,2,0x264,0x80},
{0x280,4,0x280,0x100},
{0x2B9,3,0x2B9,0x2B9},
{0x2B9,5,0x2B9,0x2B9},
{0x280,6,0x280,0x100},
{0x132,4,0x132,0x0}};
u_char n;
n = inb(XD_JUMPER);
n = (drive ? n : (n >> 2)) & 0x33;
n = (n | (n >> 2)) & 0x0F;
if (xd_geo[3*drive])
xd_manual_geo_set(drive);
else
if (n != 7) {
xd_info[drive].heads = (u_char)(geometry_table[n][1]); /* heads */
xd_info[drive].cylinders = geometry_table[n][0]; /* cylinders */
xd_info[drive].sectors = 17; /* sectors */
#if 0
xd_info[drive].rwrite = geometry_table[n][2]; /* reduced write */
xd_info[drive].precomp = geometry_table[n][3] /* write precomp */
xd_info[drive].ecc = 0x0B; /* ecc length */
#endif /* 0 */
}
else {
printk("xd%c: undetermined drive geometry\n",'a'+drive);
return;
}
xd_info[drive].control = 5; /* control byte */
xd_setparam(CMD_DTCSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,geometry_table[n][2],geometry_table[n][3],0x0B);
xd_recalibrate(drive);
}
static void __init xd_dtc_init_drive (u_char drive)
{
u_char cmdblk[6],buf[64];
xd_build(cmdblk,CMD_DTCGETGEOM,drive,0,0,0,0,0);
if (!xd_command(cmdblk,PIO_MODE,buf,NULL,NULL,XD_TIMEOUT * 2)) {
xd_info[drive].heads = buf[0x0A]; /* heads */
xd_info[drive].cylinders = ((u_short *) (buf))[0x04]; /* cylinders */
xd_info[drive].sectors = 17; /* sectors */
if (xd_geo[3*drive])
xd_manual_geo_set(drive);
#if 0
xd_info[drive].rwrite = ((u_short *) (buf + 1))[0x05]; /* reduced write */
xd_info[drive].precomp = ((u_short *) (buf + 1))[0x06]; /* write precomp */
xd_info[drive].ecc = buf[0x0F]; /* ecc length */
#endif /* 0 */
xd_info[drive].control = 0; /* control byte */
xd_setparam(CMD_DTCSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,((u_short *) (buf + 1))[0x05],((u_short *) (buf + 1))[0x06],buf[0x0F]);
xd_build(cmdblk,CMD_DTCSETSTEP,drive,0,0,0,0,7);
if (xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT * 2))
printk("xd_dtc_init_drive: error setting step rate for xd%c\n", 'a'+drive);
}
else
printk("xd_dtc_init_drive: error reading geometry for xd%c\n", 'a'+drive);
}
static void __init xd_wd_init_controller (unsigned int address)
{
switch (address) {
case 0x00000:
case 0xC8000: break; /*initial: 0x320 */
case 0xCA000: xd_iobase = 0x324; break;
case 0xCC000: xd_iobase = 0x328; break;
case 0xCE000: xd_iobase = 0x32C; break;
case 0xD0000: xd_iobase = 0x328; break; /* ? */
case 0xD8000: xd_iobase = 0x32C; break; /* ? */
default: printk("xd_wd_init_controller: unsupported BIOS address %06x\n",address);
break;
}
xd_maxsectors = 0x01; /* this one doesn't wrap properly either... */
outb(0,XD_RESET); /* reset the controller */
msleep(XD_INIT_DISK_DELAY);
}
static void __init xd_wd_init_drive (u_char drive)
{
/* values from controller's BIOS - BIOS may be disabled */
static u_short geometry_table[][4] = {
{0x264,4,0x1C2,0x1C2}, /* common part */
{0x132,4,0x099,0x0},
{0x267,2,0x1C2,0x1C2},
{0x267,4,0x1C2,0x1C2},
{0x334,6,0x335,0x335}, /* 1004 series RLL */
{0x30E,4,0x30F,0x3DC},
{0x30E,2,0x30F,0x30F},
{0x267,4,0x268,0x268},
{0x3D5,5,0x3D6,0x3D6}, /* 1002 series RLL */
{0x3DB,7,0x3DC,0x3DC},
{0x264,4,0x265,0x265},
{0x267,4,0x268,0x268}};
u_char cmdblk[6],buf[0x200];
u_char n = 0,rll,jumper_state,use_jumper_geo;
u_char wd_1002 = (xd_sigs[xd_type].string[7] == '6');
jumper_state = ~(inb(0x322));
if (jumper_state & 0x40)
xd_irq = 9;
rll = (jumper_state & 0x30) ? (0x04 << wd_1002) : 0;
xd_build(cmdblk,CMD_READ,drive,0,0,0,1,0);
if (!xd_command(cmdblk,PIO_MODE,buf,NULL,NULL,XD_TIMEOUT * 2)) {
xd_info[drive].heads = buf[0x1AF]; /* heads */
xd_info[drive].cylinders = ((u_short *) (buf + 1))[0xD6]; /* cylinders */
xd_info[drive].sectors = 17; /* sectors */
if (xd_geo[3*drive])
xd_manual_geo_set(drive);
#if 0
xd_info[drive].rwrite = ((u_short *) (buf))[0xD8]; /* reduced write */
xd_info[drive].wprecomp = ((u_short *) (buf))[0xDA]; /* write precomp */
xd_info[drive].ecc = buf[0x1B4]; /* ecc length */
#endif /* 0 */
xd_info[drive].control = buf[0x1B5]; /* control byte */
use_jumper_geo = !(xd_info[drive].heads) || !(xd_info[drive].cylinders);
if (xd_geo[3*drive]) {
xd_manual_geo_set(drive);
xd_info[drive].control = rll ? 7 : 5;
}
else if (use_jumper_geo) {
n = (((jumper_state & 0x0F) >> (drive << 1)) & 0x03) | rll;
xd_info[drive].cylinders = geometry_table[n][0];
xd_info[drive].heads = (u_char)(geometry_table[n][1]);
xd_info[drive].control = rll ? 7 : 5;
#if 0
xd_info[drive].rwrite = geometry_table[n][2];
xd_info[drive].wprecomp = geometry_table[n][3];
xd_info[drive].ecc = 0x0B;
#endif /* 0 */
}
if (!wd_1002) {
if (use_jumper_geo)
xd_setparam(CMD_WDSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,
geometry_table[n][2],geometry_table[n][3],0x0B);
else
xd_setparam(CMD_WDSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,
((u_short *) (buf))[0xD8],((u_short *) (buf))[0xDA],buf[0x1B4]);
}
/* 1002 based RLL controller requests converted addressing, but reports physical
(physical 26 sec., logical 17 sec.)
1004 based ???? */
if (rll & wd_1002) {
if ((xd_info[drive].cylinders *= 26,
xd_info[drive].cylinders /= 17) > 1023)
xd_info[drive].cylinders = 1023; /* 1024 ? */
#if 0
xd_info[drive].rwrite *= 26;
xd_info[drive].rwrite /= 17;
xd_info[drive].wprecomp *= 26
xd_info[drive].wprecomp /= 17;
#endif /* 0 */
}
}
else
printk("xd_wd_init_drive: error reading geometry for xd%c\n",'a'+drive);
}
static void __init xd_seagate_init_controller (unsigned int address)
{
switch (address) {
case 0x00000:
case 0xC8000: break; /*initial: 0x320 */
case 0xD0000: xd_iobase = 0x324; break;
case 0xD8000: xd_iobase = 0x328; break;
case 0xE0000: xd_iobase = 0x32C; break;
default: printk("xd_seagate_init_controller: unsupported BIOS address %06x\n",address);
break;
}
xd_maxsectors = 0x40;
outb(0,XD_RESET); /* reset the controller */
}
static void __init xd_seagate_init_drive (u_char drive)
{
u_char cmdblk[6],buf[0x200];
xd_build(cmdblk,CMD_ST11GETGEOM,drive,0,0,0,1,0);
if (!xd_command(cmdblk,PIO_MODE,buf,NULL,NULL,XD_TIMEOUT * 2)) {
xd_info[drive].heads = buf[0x04]; /* heads */
xd_info[drive].cylinders = (buf[0x02] << 8) | buf[0x03]; /* cylinders */
xd_info[drive].sectors = buf[0x05]; /* sectors */
xd_info[drive].control = 0; /* control byte */
}
else
printk("xd_seagate_init_drive: error reading geometry from xd%c\n", 'a'+drive);
}
/* Omti support courtesy Dirk Melchers */
static void __init xd_omti_init_controller (unsigned int address)
{
switch (address) {
case 0x00000:
case 0xC8000: break; /*initial: 0x320 */
case 0xD0000: xd_iobase = 0x324; break;
case 0xD8000: xd_iobase = 0x328; break;
case 0xE0000: xd_iobase = 0x32C; break;
default: printk("xd_omti_init_controller: unsupported BIOS address %06x\n",address);
break;
}
xd_maxsectors = 0x40;
outb(0,XD_RESET); /* reset the controller */
}
static void __init xd_omti_init_drive (u_char drive)
{
/* gets infos from drive */
xd_override_init_drive(drive);
/* set other parameters, Hardcoded, not that nice :-) */
xd_info[drive].control = 2;
}
/* Xebec support (AK) */
static void __init xd_xebec_init_controller (unsigned int address)
{
/* iobase may be set manually in range 0x300 - 0x33C
irq may be set manually to 2(9),3,4,5,6,7
dma may be set manually to 1,2,3
(How to detect them ???)
BIOS address may be set manually in range 0x0 - 0xF8000
If you need non-standard settings use the xd=... command */
switch (address) {
case 0x00000:
case 0xC8000: /* initially: xd_iobase==0x320 */
case 0xD0000:
case 0xD2000:
case 0xD4000:
case 0xD6000:
case 0xD8000:
case 0xDA000:
case 0xDC000:
case 0xDE000:
case 0xE0000: break;
default: printk("xd_xebec_init_controller: unsupported BIOS address %06x\n",address);
break;
}
xd_maxsectors = 0x01;
outb(0,XD_RESET); /* reset the controller */
msleep(XD_INIT_DISK_DELAY);
}
static void __init xd_xebec_init_drive (u_char drive)
{
/* values from controller's BIOS - BIOS chip may be removed */
static u_short geometry_table[][5] = {
{0x132,4,0x080,0x080,0x7},
{0x132,4,0x080,0x080,0x17},
{0x264,2,0x100,0x100,0x7},
{0x264,2,0x100,0x100,0x17},
{0x132,8,0x080,0x080,0x7},
{0x132,8,0x080,0x080,0x17},
{0x264,4,0x100,0x100,0x6},
{0x264,4,0x100,0x100,0x17},
{0x2BC,5,0x2BC,0x12C,0x6},
{0x3A5,4,0x3A5,0x3A5,0x7},
{0x26C,6,0x26C,0x26C,0x7},
{0x200,8,0x200,0x100,0x17},
{0x400,5,0x400,0x400,0x7},
{0x400,6,0x400,0x400,0x7},
{0x264,8,0x264,0x200,0x17},
{0x33E,7,0x33E,0x200,0x7}};
u_char n;
n = inb(XD_JUMPER) & 0x0F; /* BIOS's drive number: same geometry
is assumed for BOTH drives */
if (xd_geo[3*drive])
xd_manual_geo_set(drive);
else {
xd_info[drive].heads = (u_char)(geometry_table[n][1]); /* heads */
xd_info[drive].cylinders = geometry_table[n][0]; /* cylinders */
xd_info[drive].sectors = 17; /* sectors */
#if 0
xd_info[drive].rwrite = geometry_table[n][2]; /* reduced write */
xd_info[drive].precomp = geometry_table[n][3] /* write precomp */
xd_info[drive].ecc = 0x0B; /* ecc length */
#endif /* 0 */
}
xd_info[drive].control = geometry_table[n][4]; /* control byte */
xd_setparam(CMD_XBSETPARAM,drive,xd_info[drive].heads,xd_info[drive].cylinders,geometry_table[n][2],geometry_table[n][3],0x0B);
xd_recalibrate(drive);
}
/* xd_override_init_drive: this finds disk geometry in a "binary search" style, narrowing in on the "correct" number of heads
etc. by trying values until it gets the highest successful value. Idea courtesy Salvador Abreu (spa@fct.unl.pt). */
static void __init xd_override_init_drive (u_char drive)
{
u_short min[] = { 0,0,0 },max[] = { 16,1024,64 },test[] = { 0,0,0 };
u_char cmdblk[6],i;
if (xd_geo[3*drive])
xd_manual_geo_set(drive);
else {
for (i = 0; i < 3; i++) {
while (min[i] != max[i] - 1) {
test[i] = (min[i] + max[i]) / 2;
xd_build(cmdblk,CMD_SEEK,drive,(u_char) test[0],(u_short) test[1],(u_char) test[2],0,0);
if (!xd_command(cmdblk,PIO_MODE,NULL,NULL,NULL,XD_TIMEOUT * 2))
min[i] = test[i];
else
max[i] = test[i];
}
test[i] = min[i];
}
xd_info[drive].heads = (u_char) min[0] + 1;
xd_info[drive].cylinders = (u_short) min[1] + 1;
xd_info[drive].sectors = (u_char) min[2] + 1;
}
xd_info[drive].control = 0;
}
/* xd_setup: initialise controller from command line parameters */
static void __init do_xd_setup (int *integers)
{
switch (integers[0]) {
case 4: if (integers[4] < 0)
nodma = 1;
else if (integers[4] < 8)
xd_dma = integers[4];
case 3: if ((integers[3] > 0) && (integers[3] <= 0x3FC))
xd_iobase = integers[3];
case 2: if ((integers[2] > 0) && (integers[2] < 16))
xd_irq = integers[2];
case 1: xd_override = 1;
if ((integers[1] >= 0) && (integers[1] < ARRAY_SIZE(xd_sigs)))
xd_type = integers[1];
case 0: break;
default:printk("xd: too many parameters for xd\n");
}
xd_maxsectors = 0x01;
}
/* xd_setparam: set the drive characteristics */
static void __init xd_setparam (u_char command,u_char drive,u_char heads,u_short cylinders,u_short rwrite,u_short wprecomp,u_char ecc)
{
u_char cmdblk[14];
xd_build(cmdblk,command,drive,0,0,0,0,0);
cmdblk[6] = (u_char) (cylinders >> 8) & 0x03;
cmdblk[7] = (u_char) (cylinders & 0xFF);
cmdblk[8] = heads & 0x1F;
cmdblk[9] = (u_char) (rwrite >> 8) & 0x03;
cmdblk[10] = (u_char) (rwrite & 0xFF);
cmdblk[11] = (u_char) (wprecomp >> 8) & 0x03;
cmdblk[12] = (u_char) (wprecomp & 0xFF);
cmdblk[13] = ecc;
/* Some controllers require geometry info as data, not command */
if (xd_command(cmdblk,PIO_MODE,NULL,&cmdblk[6],NULL,XD_TIMEOUT * 2))
printk("xd: error setting characteristics for xd%c\n", 'a'+drive);
}
#ifdef MODULE
module_param_array(xd, int, NULL, 0);
module_param_array(xd_geo, int, NULL, 0);
module_param(nodma, bool, 0);
MODULE_LICENSE("GPL");
void cleanup_module(void)
{
int i;
unregister_blkdev(XT_DISK_MAJOR, "xd");
for (i = 0; i < xd_drives; i++) {
del_gendisk(xd_gendisk[i]);
put_disk(xd_gendisk[i]);
}
blk_cleanup_queue(xd_queue);
release_region(xd_iobase,4);
if (xd_drives) {
free_irq(xd_irq, NULL);
free_dma(xd_dma);
if (xd_dma_buffer)
xd_dma_mem_free((unsigned long)xd_dma_buffer, xd_maxsectors * 0x200);
}
}
#else
static int __init xd_setup (char *str)
{
int ints[5];
get_options (str, ARRAY_SIZE (ints), ints);
do_xd_setup (ints);
return 1;
}
/* xd_manual_geo_init: initialise drive geometry from command line parameters
(used only for WD drives) */
static int __init xd_manual_geo_init (char *str)
{
int i, integers[1 + 3*XD_MAXDRIVES];
get_options (str, ARRAY_SIZE (integers), integers);
if (integers[0]%3 != 0) {
printk("xd: incorrect number of parameters for xd_geo\n");
return 1;
}
for (i = 0; (i < integers[0]) && (i < 3*XD_MAXDRIVES); i++)
xd_geo[i] = integers[i+1];
return 1;
}
__setup ("xd=", xd_setup);
__setup ("xd_geo=", xd_manual_geo_init);
#endif /* MODULE */
module_init(xd_init);
MODULE_ALIAS_BLOCKDEV_MAJOR(XT_DISK_MAJOR);
drivers/block/xd.h deleted 100644 → 0
View file @ ee89f812
#ifndef _LINUX_XD_H
#define _LINUX_XD_H
/*
* This file contains the definitions for the IO ports and errors etc. for XT hard disk controllers (at least the DTC 5150X).
*
* Author: Pat Mackinlay, pat@it.com.au
* Date: 29/09/92
*
* Revised: 01/01/93, ...
*
* Ref: DTC 5150X Controller Specification (thanks to Kevin Fowler, kevinf@agora.rain.com)
* Also thanks to: Salvador Abreu, Dave Thaler, Risto Kankkunen and Wim Van Dorst.
*/
#include <linux/interrupt.h>
/* XT hard disk controller registers */
#define XD_DATA (xd_iobase + 0x00) /* data RW register */
#define XD_RESET (xd_iobase + 0x01) /* reset WO register */
#define XD_STATUS (xd_iobase + 0x01) /* status RO register */
#define XD_SELECT (xd_iobase + 0x02) /* select WO register */
#define XD_JUMPER (xd_iobase + 0x02) /* jumper RO register */
#define XD_CONTROL (xd_iobase + 0x03) /* DMAE/INTE WO register */
#define XD_RESERVED (xd_iobase + 0x03) /* reserved */
/* XT hard disk controller commands (incomplete list) */
#define CMD_TESTREADY 0x00 /* test drive ready */
#define CMD_RECALIBRATE 0x01 /* recalibrate drive */
#define CMD_SENSE 0x03 /* request sense */
#define CMD_FORMATDRV 0x04 /* format drive */
#define CMD_VERIFY 0x05 /* read verify */
#define CMD_FORMATTRK 0x06 /* format track */
#define CMD_FORMATBAD 0x07 /* format bad track */
#define CMD_READ 0x08 /* read */
#define CMD_WRITE 0x0A /* write */
#define CMD_SEEK 0x0B /* seek */
/* Controller specific commands */
#define CMD_DTCSETPARAM 0x0C /* set drive parameters (DTC 5150X & CX only?) */
#define CMD_DTCGETECC 0x0D /* get ecc error length (DTC 5150X only?) */
#define CMD_DTCREADBUF 0x0E /* read sector buffer (DTC 5150X only?) */
#define CMD_DTCWRITEBUF 0x0F /* write sector buffer (DTC 5150X only?) */
#define CMD_DTCREMAPTRK 0x11 /* assign alternate track (DTC 5150X only?) */
#define CMD_DTCGETPARAM 0xFB /* get drive parameters (DTC 5150X only?) */
#define CMD_DTCSETSTEP 0xFC /* set step rate (DTC 5150X only?) */
#define CMD_DTCSETGEOM 0xFE /* set geometry data (DTC 5150X only?) */
#define CMD_DTCGETGEOM 0xFF /* get geometry data (DTC 5150X only?) */
#define CMD_ST11GETGEOM 0xF8 /* get geometry data (Seagate ST11R/M only?) */
#define CMD_WDSETPARAM 0x0C /* set drive parameters (WD 1004A27X only?) */
#define CMD_XBSETPARAM 0x0C /* set drive parameters (XEBEC only?) */
/* Bits for command status byte */
#define CSB_ERROR 0x02 /* error */
#define CSB_LUN 0x20 /* logical Unit Number */
/* XT hard disk controller status bits */
#define STAT_READY 0x01 /* controller is ready */
#define STAT_INPUT 0x02 /* data flowing from controller to host */
#define STAT_COMMAND 0x04 /* controller in command phase */
#define STAT_SELECT 0x08 /* controller is selected */
#define STAT_REQUEST 0x10 /* controller requesting data */
#define STAT_INTERRUPT 0x20 /* controller requesting interrupt */
/* XT hard disk controller control bits */
#define PIO_MODE 0x00 /* control bits to set for PIO */
#define DMA_MODE 0x03 /* control bits to set for DMA & interrupt */
#define XD_MAXDRIVES 2 /* maximum 2 drives */
#define XD_TIMEOUT HZ /* 1 second timeout */
#define XD_RETRIES 4 /* maximum 4 retries */
#undef DEBUG /* define for debugging output */
#ifdef DEBUG
#define DEBUG_STARTUP /* debug driver initialisation */
#define DEBUG_OVERRIDE /* debug override geometry detection */
#define DEBUG_READWRITE /* debug each read/write command */
#define DEBUG_OTHER /* debug misc. interrupt/DMA stuff */
#define DEBUG_COMMAND /* debug each controller command */
#endif /* DEBUG */
/* this structure defines the XT drives and their types */
typedef struct {
u_char heads;
u_short cylinders;
u_char sectors;
u_char control;
int unit;
} XD_INFO;
/* this structure defines a ROM BIOS signature */
typedef struct {
unsigned int offset;
const char *string;
void (*init_controller)(unsigned int address);
void (*init_drive)(u_char drive);
const char *name;
} XD_SIGNATURE;
#ifndef MODULE
static int xd_manual_geo_init (char *command);
#endif /* MODULE */
static u_char xd_detect (u_char *controller, unsigned int *address);
static u_char xd_initdrives (void (*init_drive)(u_char drive));
static void do_xd_request (struct request_queue * q);
static int xd_ioctl (struct block_device *bdev,fmode_t mode,unsigned int cmd,unsigned long arg);
static int xd_readwrite (u_char operation,XD_INFO *disk,char *buffer,u_int block,u_int count);
static void xd_recalibrate (u_char drive);
static irqreturn_t xd_interrupt_handler(int irq, void *dev_id);
static u_char xd_setup_dma (u_char opcode,u_char *buffer,u_int count);
static u_char *xd_build (u_char *cmdblk,u_char command,u_char drive,u_char head,u_short cylinder,u_char sector,u_char count,u_char control);
static void xd_watchdog (unsigned long unused);
static inline u_char xd_waitport (u_short port,u_char flags,u_char mask,u_long timeout);
static u_int xd_command (u_char *command,u_char mode,u_char *indata,u_char *outdata,u_char *sense,u_long timeout);
/* card specific setup and geometry gathering code */
static void xd_dtc_init_controller (unsigned int address);
static void xd_dtc5150cx_init_drive (u_char drive);
static void xd_dtc_init_drive (u_char drive);
static void xd_wd_init_controller (unsigned int address);
static void xd_wd_init_drive (u_char drive);
static void xd_seagate_init_controller (unsigned int address);
static void xd_seagate_init_drive (u_char drive);
static void xd_omti_init_controller (unsigned int address);
static void xd_omti_init_drive (u_char drive);
static void xd_xebec_init_controller (unsigned int address);
static void xd_xebec_init_drive (u_char drive);
static void xd_setparam (u_char command,u_char drive,u_char heads,u_short cylinders,u_short rwrite,u_short wprecomp,u_char ecc);
static void xd_override_init_drive (u_char drive);
#endif /* _LINUX_XD_H */
drivers/block/xen-blkback/blkback.c
View file @ f042fea0
......@@ -46,6 +46,7 @@
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <xen/balloon.h>
#include "common.h"
/*
......@@ -239,6 +240,7 @@ static void free_persistent_gnts(struct rb_root *root, unsigned int num)
ret = gnttab_unmap_refs(unmap, NULL, pages,
segs_to_unmap);
BUG_ON(ret);
free_xenballooned_pages(segs_to_unmap, pages);
segs_to_unmap = 0;
}
......@@ -527,8 +529,8 @@ static int xen_blkbk_map(struct blkif_request *req,
GFP_KERNEL);
if (!persistent_gnt)
return -ENOMEM;
persistent_gnt->page = alloc_page(GFP_KERNEL);
if (!persistent_gnt->page) {
if (alloc_xenballooned_pages(1, &persistent_gnt->page,
false)) {
kfree(persistent_gnt);
return -ENOMEM;
}
......@@ -879,7 +881,6 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
goto fail_response;
}
preq.dev = req->u.rw.handle;
preq.sector_number = req->u.rw.sector_number;
preq.nr_sects = 0;
......
drivers/block/xen-blkback/xenbus.c
View file @ f042fea0
......@@ -367,6 +367,7 @@ static int xen_blkbk_remove(struct xenbus_device *dev)
be->blkif = NULL;
}
kfree(be->mode);
kfree(be);
dev_set_drvdata(&dev->dev, NULL);
return 0;
......@@ -502,6 +503,7 @@ static void backend_changed(struct xenbus_watch *watch,
= container_of(watch, struct backend_info, backend_watch);
struct xenbus_device *dev = be->dev;
int cdrom = 0;
unsigned long handle;
char *device_type;
DPRINTK("");
......@@ -521,8 +523,8 @@ static void backend_changed(struct xenbus_watch *watch,
return;
}
if ((be->major || be->minor) &&
((be->major != major) || (be->minor != minor))) {
if (be->major | be->minor) {
if (be->major != major || be->minor != minor)
pr_warn(DRV_PFX "changing physical device (from %x:%x to %x:%x) not supported.\n",
be->major, be->minor, major, minor);
return;
......@@ -542,12 +544,8 @@ static void backend_changed(struct xenbus_watch *watch,
kfree(device_type);
}
if (be->major == 0 && be->minor == 0) {
/* Front end dir is a number, which is used as the handle. */
char *p = strrchr(dev->otherend, '/') + 1;
long handle;
err = strict_strtoul(p, 0, &handle);
err = strict_strtoul(strrchr(dev->otherend, '/') + 1, 0, &handle);
if (err)
return;
......@@ -555,23 +553,24 @@ static void backend_changed(struct xenbus_watch *watch,
be->minor = minor;
err = xen_vbd_create(be->blkif, handle, major, minor,
(NULL == strchr(be->mode, 'w')), cdrom);
if (err) {
be->major = 0;
be->minor = 0;
xenbus_dev_fatal(dev, err, "creating vbd structure");
return;
}
!strchr(be->mode, 'w'), cdrom);
if (err)
xenbus_dev_fatal(dev, err, "creating vbd structure");
else {
err = xenvbd_sysfs_addif(dev);
if (err) {
xen_vbd_free(&be->blkif->vbd);
be->major = 0;
be->minor = 0;
xenbus_dev_fatal(dev, err, "creating sysfs entries");
return;
}
}
if (err) {
kfree(be->mode);
be->mode = NULL;
be->major = 0;
be->minor = 0;
} else {
/* We're potentially connected now */
xen_update_blkif_status(be->blkif);
}
......
drivers/block/xen-blkfront.c
View file @ f042fea0
......@@ -791,7 +791,7 @@ static void blkif_restart_queue(struct work_struct *work)
static void blkif_free(struct blkfront_info *info, int suspend)
{
struct llist_node *all_gnts;
struct grant *persistent_gnt;
struct grant *persistent_gnt, *tmp;
struct llist_node *n;
/* Prevent new requests being issued until we fix things up. */
......@@ -805,10 +805,17 @@ static void blkif_free(struct blkfront_info *info, int suspend)
/* Remove all persistent grants */
if (info->persistent_gnts_c) {
all_gnts = llist_del_all(&info->persistent_gnts);
llist_for_each_entry_safe(persistent_gnt, n, all_gnts, node) {
persistent_gnt = llist_entry(all_gnts, typeof(*(persistent_gnt)), node);
while (persistent_gnt) {
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
__free_page(pfn_to_page(persistent_gnt->pfn));
kfree(persistent_gnt);
tmp = persistent_gnt;
n = persistent_gnt->node.next;
if (n)
persistent_gnt = llist_entry(n, typeof(*(persistent_gnt)), node);
else
persistent_gnt = NULL;
kfree(tmp);
}
info->persistent_gnts_c = 0;
}
......
include/linux/llist.h
View file @ f042fea0
......@@ -124,31 +124,6 @@ static inline void init_llist_head(struct llist_head *list)
&(pos)->member != NULL; \
(pos) = llist_entry((pos)->member.next, typeof(*(pos)), member))
/**
* llist_for_each_entry_safe - iterate safely against remove over some entries
* of lock-less list of given type.
* @pos: the type * to use as a loop cursor.
* @n: another type * to use as a temporary storage.
* @node: the fist entry of deleted list entries.
* @member: the name of the llist_node with the struct.
*
* In general, some entries of the lock-less list can be traversed
* safely only after being removed from list, so start with an entry
* instead of list head. This variant allows removal of entries
* as we iterate.
*
* If being used on entries deleted from lock-less list directly, the
* traverse order is from the newest to the oldest added entry. If
* you want to traverse from the oldest to the newest, you must
* reverse the order by yourself before traversing.
*/
#define llist_for_each_entry_safe(pos, n, node, member) \
for ((pos) = llist_entry((node), typeof(*(pos)), member), \
(n) = (pos)->member.next; \
&(pos)->member != NULL; \
(pos) = llist_entry(n, typeof(*(pos)), member), \
(n) = (&(pos)->member != NULL) ? (pos)->member.next : NULL)
/**
* llist_empty - tests whether a lock-less list is empty
* @head: the list to test
......
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